660657531320 has 64 divisors (see below), whose sum is σ = 1525422780000. Its totient is φ = 257411501568.

The previous prime is 660657531301. The next prime is 660657531379. The reversal of 660657531320 is 23135756066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826295 + ... + 1415654.

Almost surely, 2^660657531320 is an apocalyptic number.

It is an amenable number.

660657531320 is an abundant number, since it is smaller than the sum of its proper divisors (864765248680).

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

660657531320 is a wasteful number, since it uses less digits than its factorization.

660657531320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242152 (or 2242148 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 660657531320 in words is "six hundred sixty billion, six hundred fifty-seven million, five hundred thirty-one thousand, three hundred twenty".