666574638032 has 10 divisors (see below), whose sum is σ = 1291488361218. Its totient is φ = 333287319008.

The previous prime is 666574638017. The next prime is 666574638043. The reversal of 666574638032 is 230836475666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 359299541056 + 307275096976 = 599416^2 + 554324^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20830457423 + ... + 20830457454.

Almost surely, 2^666574638032 is an apocalyptic number.

It is an amenable number.

666574638032 is a deficient number, since it is larger than the sum of its proper divisors (624913723186).

666574638032 is a wasteful number, since it uses less digits than its factorization.

666574638032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41660914885 (or 41660914879 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 666574638032 in words is "six hundred sixty-six billion, five hundred seventy-four million, six hundred thirty-eight thousand, thirty-two".