156668938 has 4 divisors (see below), whose sum is σ = 235003410. Its totient is φ = 78334468.

The previous prime is 156668921. The next prime is 156668951. The reversal of 156668938 is 839866651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 137194369 + 19474569 = 11713^2 + 4413^2 .

It is a super-2 number, since 2×156668938² = 49090312268095688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39167233 + ... + 39167236.

Almost surely, 2^156668938 is an apocalyptic number.

156668938 is a deficient number, since it is larger than the sum of its proper divisors (78334472).

156668938 is an equidigital number, since it uses as much as digits as its factorization.

156668938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78334471.

The product of its digits is 1866240, while the sum is 52.

The square root of 156668938 is about 12516.7463024542. The cubic root of 156668938 is about 539.0896160267.

The spelling of 156668938 in words is "one hundred fifty-six million, six hundred sixty-eight thousand, nine hundred thirty-eight".