663746228928 has 140 divisors (see below), whose sum is σ = 1972231759872. Its totient is φ = 220722485760.

The previous prime is 663746228903. The next prime is 663746228983. The reversal of 663746228928 is 829822647366.

663746228928 is a `hidden beast` number, since 6 + 63 + 7 + 462 + 28 + 92 + 8 = 666.

It is a super-2 number, since 2×663746228928² (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 19 ways as a sum of consecutive naturals, for example, 2030401 + ... + 2334527.

Almost surely, 2^663746228928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663746228928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986115879936).

663746228928 is an abundant number, since it is smaller than the sum of its proper divisors (1308485530944).

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

663746228928 is a wasteful number, since it uses less digits than its factorization.

663746228928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304572 (or 304553 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 63.

The spelling of 663746228928 in words is "six hundred sixty-three billion, seven hundred forty-six million, two hundred twenty-eight thousand, nine hundred twenty-eight".