664740156 has 24 divisors (see below), whose sum is σ = 1632695680. Its totient is φ = 209917872.

The previous prime is 664740143. The next prime is 664740169. The reversal of 664740156 is 651047466.

It is an interprime number because it is at equal distance from previous prime (664740143) and next prime (664740169).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457536 + ... + 1457991.

Almost surely, 2^664740156 is an apocalyptic number.

It is an amenable number.

664740156 is an abundant number, since it is smaller than the sum of its proper divisors (967955524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664740156 is a wasteful number, since it uses less digits than its factorization.

664740156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915553 (or 2915551 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 664740156 is about 25782.5552651400. Note that the first 3 decimals coincide. The cubic root of 664740156 is about 872.7381718296.

The spelling of 664740156 in words is "six hundred sixty-four million, seven hundred forty thousand, one hundred fifty-six".