156993957 has 10 divisors (see below), whose sum is σ = 234521958. Its totient is φ = 104662584.

The previous prime is 156993943. The next prime is 156993983. The reversal of 156993957 is 759399651.

156993957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 134583201 + 22410756 = 11601^2 + 4734^2 .

It is not a de Polignac number, because 156993957 - 2¹⁰ = 156992933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156993457) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 969018 + ... + 969179.

Almost surely, 2^156993957 is an apocalyptic number.

It is an amenable number.

156993957 is a deficient number, since it is larger than the sum of its proper divisors (77528001).

156993957 is an equidigital number, since it uses as much as digits as its factorization.

156993957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938209 (or 1938200 counting only the distinct ones).

The product of its digits is 2296350, while the sum is 54.

The square root of 156993957 is about 12529.7229418691. The cubic root of 156993957 is about 539.4621496538.

The spelling of 156993957 in words is "one hundred fifty-six million, nine hundred ninety-three thousand, nine hundred fifty-seven".