11666150155551 has 4 divisors (see below), whose sum is σ = 15554866874072. Its totient is φ = 7777433437032.

The previous prime is 11666150155511. The next prime is 11666150155643. The reversal of 11666150155551 is 15555105166611.

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

It is not a de Polignac number, because 11666150155551 - 2⁶ = 11666150155487 is a prime.

It is a super-2 number, since 2×11666150155551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11666150155551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666150155511) 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, 1944358359256 + ... + 1944358359261.

It is an arithmetic number, because the mean of its divisors is an integer number (3888716718518).

Almost surely, 2^{11666150155551} is an apocalyptic number.

11666150155551 is a deficient number, since it is larger than the sum of its proper divisors (3888716718521).

11666150155551 is an equidigital number, since it uses as much as digits as its factorization.

11666150155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888716718520.

The product of its (nonzero) digits is 675000, while the sum is 48.

The spelling of 11666150155551 in words is "eleven trillion, six hundred sixty-six billion, one hundred fifty million, one hundred fifty-five thousand, five hundred fifty-one".