156668631 has 12 divisors (see below), whose sum is σ = 242996472. Its totient is φ = 89524848.

The previous prime is 156668621. The next prime is 156668639. The reversal of 156668631 is 136866651.

It is not a de Polignac number, because 156668631 - 2⁵ = 156668599 is a prime.

It is a super-2 number, since 2×156668631² = 49090119878828322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156668639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532740 + ... + 533033.

It is an arithmetic number, because the mean of its divisors is an integer number (20249706).

Almost surely, 2^156668631 is an apocalyptic number.

156668631 is a deficient number, since it is larger than the sum of its proper divisors (86327841).

156668631 is a wasteful number, since it uses less digits than its factorization.

156668631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065790 (or 1065783 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 156668631 is about 12516.7340388777. The cubic root of 156668631 is about 539.0892639029.

The spelling of 156668631 in words is "one hundred fifty-six million, six hundred sixty-eight thousand, six hundred thirty-one".