11666808169 has 3 divisors (see below), whose sum is σ = 11666916183. Its totient is φ = 11666700156.

The previous prime is 11666808151. The next prime is 11666808187. The reversal of 11666808169 is 96180866611.

It is a happy number.

The square root of 11666808169 is 108013.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96180866611 = 167 ⋅575933333.

It is an interprime number because it is at equal distance from previous prime (11666808151) and next prime (11666808187).

It can be written as a sum of positive squares in only one way, i.e., 8880235225 + 2786572944 = 94235^2 + 52788^2 .

It is not a de Polignac number, because 11666808169 - 2¹⁵ = 11666775401 is a prime.

It is a super-4 number, since 4×11666808169⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11666808869) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 54007 + ... + 162019.

It is an arithmetic number, because the mean of its divisors is an integer number (3888972061).

Almost surely, 2^11666808169 is an apocalyptic number.

11666808169 is the 108013-rd square number.

11666808169 is the 54007-th centered octagonal number.

It is an amenable number.

11666808169 is a deficient number, since it is larger than the sum of its proper divisors (108014).

11666808169 is an frugal number, since it uses more digits than its factorization.

11666808169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216026 (or 108013 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 11666808169 in words is "eleven billion, six hundred sixty-six million, eight hundred eight thousand, one hundred sixty-nine".