156555656861 has 4 divisors (see below), whose sum is σ = 156562197792. Its totient is φ = 156549115932.

The previous prime is 156555656857. The next prime is 156555656867. The reversal of 156555656861 is 168656555651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168656555651 = 59 ⋅2858585689.

It is a cyclic number.

It is not a de Polignac number, because 156555656861 - 2² = 156555656857 is a prime.

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 156555656861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156555656867) 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, 3234431 + ... + 3282476.

It is an arithmetic number, because the mean of its divisors is an integer number (39140549448).

Almost surely, 2^156555656861 is an apocalyptic number.

It is an amenable number.

156555656861 is a deficient number, since it is larger than the sum of its proper divisors (6540931).

156555656861 is an equidigital number, since it uses as much as digits as its factorization.

156555656861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540930.

The product of its digits is 32400000, while the sum is 59.

The spelling of 156555656861 in words is "one hundred fifty-six billion, five hundred fifty-five million, six hundred fifty-six thousand, eight hundred sixty-one".