665394736 has 20 divisors (see below), whose sum is σ = 1293107464. Its totient is φ = 331689600.

The previous prime is 665394733. The next prime is 665394749. The reversal of 665394736 is 637493566.

It is a self number, because there is not a number n which added to its sum of digits gives 665394736.

It is not an unprimeable number, because it can be changed into a prime (665394733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57525 + ... + 68116.

Almost surely, 2^665394736 is an apocalyptic number.

It is an amenable number.

665394736 is a deficient number, since it is larger than the sum of its proper divisors (627712728).

665394736 is a wasteful number, since it uses less digits than its factorization.

665394736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125980 (or 125974 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 49.

The square root of 665394736 is about 25795.2463837816. The cubic root of 665394736 is about 873.0245441486.

The spelling of 665394736 in words is "six hundred sixty-five million, three hundred ninety-four thousand, seven hundred thirty-six".