11666666161501 has 4 divisors (see below), whose sum is σ = 12564102020092. Its totient is φ = 10769230302912.

The previous prime is 11666666161483. The next prime is 11666666161511. The reversal of 11666666161501 is 10516166666611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4047134039001 + 7619532122500 = 2011749^2 + 2760350^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666666161501 - 2⁷ = 11666666161373 is a prime.

It is a super-2 number, since 2×11666666161501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666666161511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448717929276 + ... + 448717929301.

It is an arithmetic number, because the mean of its divisors is an integer number (3141025505023).

Almost surely, 2^{11666666161501} is an apocalyptic number.

It is an amenable number.

11666666161501 is a deficient number, since it is larger than the sum of its proper divisors (897435858591).

11666666161501 is an equidigital number, since it uses as much as digits as its factorization.

11666666161501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897435858590.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 11666666161501 in words is "eleven trillion, six hundred sixty-six billion, six hundred sixty-six million, one hundred sixty-one thousand, five hundred one".