665056633644 has 120 divisors (see below), whose sum is σ = 1922930941008. Its totient is φ = 199102147200.

The previous prime is 665056633609. The next prime is 665056633669. The reversal of 665056633644 is 446336650566.

It is a happy number.

665056633644 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 566 + 3 + 36 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1977882 + ... + 2289569.

Almost surely, 2^665056633644 is an apocalyptic number.

It is an amenable number.

665056633644 is an abundant number, since it is smaller than the sum of its proper divisors (1257874307364).

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

665056633644 is a wasteful number, since it uses less digits than its factorization.

665056633644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267517 (or 4267506 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 54.

The spelling of 665056633644 in words is "six hundred sixty-five billion, fifty-six million, six hundred thirty-three thousand, six hundred forty-four".