156356661972 has 48 divisors (see below), whose sum is σ = 418188417920. Its totient is φ = 44540762112.

The previous prime is 156356661953. The next prime is 156356661977. The reversal of 156356661972 is 279166653651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156356661977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2733397 + ... + 2790012.

Almost surely, 2^156356661972 is an apocalyptic number.

156356661972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

156356661972 is an abundant number, since it is smaller than the sum of its proper divisors (261831755948).

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

156356661972 is a wasteful number, since it uses less digits than its factorization.

156356661972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523760 (or 5523758 counting only the distinct ones).

The product of its digits is 12247200, while the sum is 57.

The spelling of 156356661972 in words is "one hundred fifty-six billion, three hundred fifty-six million, six hundred sixty-one thousand, nine hundred seventy-two".