663891012 has 24 divisors (see below), whose sum is σ = 1721199200. Its totient is φ = 221296968.

The previous prime is 663891001. The next prime is 663891017. The reversal of 663891012 is 210198366.

663891012 is a `hidden beast` number, since 6 + 638 + 9 + 1 + 0 + 12 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (663891017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3073462 + ... + 3073677.

Almost surely, 2^663891012 is an apocalyptic number.

It is an amenable number.

663891012 is an abundant number, since it is smaller than the sum of its proper divisors (1057308188).

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

663891012 is a wasteful number, since it uses less digits than its factorization.

663891012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147152 (or 6147144 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 663891012 is about 25766.0825893266. The cubic root of 663891012 is about 872.3663994143.

The spelling of 663891012 in words is "six hundred sixty-three million, eight hundred ninety-one thousand, twelve".