659444624640 has 108 divisors (see below), whose sum is σ = 2281609748964. Its totient is φ = 175851896832.

The previous prime is 659444624627. The next prime is 659444624651. The reversal of 659444624640 is 46426444956.

659444624640 is a `hidden beast` number, since 6 + 5 + 9 + 4 + 4 + 4 + 624 + 6 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 504259052544 + 155185572096 = 710112^2 + 393936^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28610209 + ... + 28633248.

Almost surely, 2^659444624640 is an apocalyptic number.

659444624640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

659444624640 is an abundant number, since it is smaller than the sum of its proper divisors (1622165124324).

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

659444624640 is a wasteful number, since it uses less digits than its factorization.

659444624640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57243484 (or 57243467 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 54.

The spelling of 659444624640 in words is "six hundred fifty-nine billion, four hundred forty-four million, six hundred twenty-four thousand, six hundred forty".