156660661656 has 32 divisors (see below), whose sum is σ = 435168505200. Its totient is φ = 52220220480.

The previous prime is 156660661621. The next prime is 156660661699. The reversal of 156660661656 is 656166066651.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362640205 + ... + 362640636.

Almost surely, 2^156660661656 is an apocalyptic number.

It is an amenable number.

156660661656 is an abundant number, since it is smaller than the sum of its proper divisors (278507843544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156660661656 is a wasteful number, since it uses less digits than its factorization.

156660661656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725280856 (or 725280846 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 156660661656 in words is "one hundred fifty-six billion, six hundred sixty million, six hundred sixty-one thousand, six hundred fifty-six".