665051432656 has 20 divisors (see below), whose sum is σ = 1387655393572. Its totient is φ = 306946814976.

The previous prime is 665051432621. The next prime is 665051432671. The reversal of 665051432656 is 656234150566.

It can be written as a sum of positive squares in 2 ways, for example, as 25787221056 + 639264211600 = 160584^2 + 799540^2 .

It is a super-3 number, since 3×665051432656³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598681121 + ... + 1598681536.

Almost surely, 2^665051432656 is an apocalyptic number.

It is an amenable number.

665051432656 is an abundant number, since it is smaller than the sum of its proper divisors (722603960916).

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

665051432656 is a wasteful number, since it uses less digits than its factorization.

665051432656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197362678 (or 3197362672 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 665051432656 in words is "six hundred sixty-five billion, fifty-one million, four hundred thirty-two thousand, six hundred fifty-six".