659979138560 has 320 divisors, whose sum is σ = 1862664781824. Its totient is φ = 219557068800.

The previous prime is 659979138509. The next prime is 659979138587. The reversal of 659979138560 is 65831979956.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140329169 + ... + 140333871.

Almost surely, 2^659979138560 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 659979138560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931332390912).

659979138560 is an abundant number, since it is smaller than the sum of its proper divisors (1202685643264).

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

659979138560 is a wasteful number, since it uses less digits than its factorization.

659979138560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965 (or 4949 counting only the distinct ones).

The product of its (nonzero) digits is 110224800, while the sum is 68.

The spelling of 659979138560 in words is "six hundred fifty-nine billion, nine hundred seventy-nine million, one hundred thirty-eight thousand, five hundred sixty".