663648973512 has 32 divisors (see below), whose sum is σ = 1896139924800. Its totient is φ = 189613992384.

The previous prime is 663648973501. The next prime is 663648973543. The reversal of 663648973512 is 215379846366.

It is a super-2 number, since 2×663648973512² (a number of 24 digits) contains 22 as substring.

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, 1975145587 + ... + 1975145922.

It is an arithmetic number, because the mean of its divisors is an integer number (59254372650).

Almost surely, 2^663648973512 is an apocalyptic number.

It is an amenable number.

663648973512 is an abundant number, since it is smaller than the sum of its proper divisors (1232490951288).

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

663648973512 is a wasteful number, since it uses less digits than its factorization.

663648973512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950291525 (or 3950291521 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 60.

The spelling of 663648973512 in words is "six hundred sixty-three billion, six hundred forty-eight million, nine hundred seventy-three thousand, five hundred twelve".