664798532496 has 40 divisors (see below), whose sum is σ = 1962738525504. Its totient is φ = 189942437760.

The previous prime is 664798532413. The next prime is 664798532501. The reversal of 664798532496 is 694235897466.

It is a self number, because there is not a number n which added to its sum of digits gives 664798532496.

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, 989283195 + ... + 989283866.

Almost surely, 2^664798532496 is an apocalyptic number.

It is an amenable number.

664798532496 is an abundant number, since it is smaller than the sum of its proper divisors (1297939993008).

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

664798532496 is a wasteful number, since it uses less digits than its factorization.

664798532496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978567079 (or 1978567073 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 69.

The spelling of 664798532496 in words is "six hundred sixty-four billion, seven hundred ninety-eight million, five hundred thirty-two thousand, four hundred ninety-six".