215668156 has 12 divisors (see below), whose sum is σ = 411730200. Its totient is φ = 98030960.

The previous prime is 215668133. The next prime is 215668169. The reversal of 215668156 is 651866512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450731 + ... + 2450818.

It is an arithmetic number, because the mean of its divisors is an integer number (34310850).

Almost surely, 2^215668156 is an apocalyptic number.

It is an amenable number.

215668156 is a deficient number, since it is larger than the sum of its proper divisors (196062044).

215668156 is a wasteful number, since it uses less digits than its factorization.

215668156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901564 (or 4901562 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 215668156 is about 14685.6445551430. The cubic root of 215668156 is about 599.6925795517.

The spelling of 215668156 in words is "two hundred fifteen million, six hundred sixty-eight thousand, one hundred fifty-six".