156972202947 has 72 divisors (see below), whose sum is σ = 271456640000. Its totient is φ = 85617458784.

The previous prime is 156972202939. The next prime is 156972202979. The reversal of 156972202947 is 749202279651.

156972202947 is a `hidden beast` number, since 1 + 569 + 72 + 2 + 0 + 2 + 9 + 4 + 7 = 666.

It is not a de Polignac number, because 156972202947 - 2³ = 156972202939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 156972202893 and 156972202902.

It is not an unprimeable number, because it can be changed into a prime (156972602947) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16625454 + ... + 16634892.

Almost surely, 2^156972202947 is an apocalyptic number.

156972202947 is a deficient number, since it is larger than the sum of its proper divisors (114484437053).

156972202947 is a wasteful number, since it uses less digits than its factorization.

156972202947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9997 (or 9971 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 156972202947 in words is "one hundred fifty-six billion, nine hundred seventy-two million, two hundred two thousand, nine hundred forty-seven".