156633971972 has 6 divisors (see below), whose sum is σ = 274109450958. Its totient is φ = 78316985984.

The previous prime is 156633971957. The next prime is 156633971981. The reversal of 156633971972 is 279179336651.

It can be written as a sum of positive squares in only one way, i.e., 156424996036 + 208975936 = 395506^2 + 14456^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19579246493 + ... + 19579246500.

It is an arithmetic number, because the mean of its divisors is an integer number (45684908493).

Almost surely, 2^156633971972 is an apocalyptic number.

It is an amenable number.

156633971972 is a deficient number, since it is larger than the sum of its proper divisors (117475478986).

156633971972 is a wasteful number, since it uses less digits than its factorization.

156633971972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39158492997 (or 39158492995 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 59.

The spelling of 156633971972 in words is "one hundred fifty-six billion, six hundred thirty-three million, nine hundred seventy-one thousand, nine hundred seventy-two".