660855939564 has 24 divisors (see below), whose sum is σ = 1623154939840. Its totient is φ = 208691349264.

The previous prime is 660855939553. The next prime is 660855939571. The reversal of 660855939564 is 465939558066.

It is a junction number, because it is equal to n+sod(n) for n = 660855939495 and 660855939504.

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, 1449245254 + ... + 1449245709.

Almost surely, 2^660855939564 is an apocalyptic number.

It is an amenable number.

660855939564 is an abundant number, since it is smaller than the sum of its proper divisors (962299000276).

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

660855939564 is a wasteful number, since it uses less digits than its factorization.

660855939564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898490989 (or 2898490987 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 66.

The spelling of 660855939564 in words is "six hundred sixty billion, eight hundred fifty-five million, nine hundred thirty-nine thousand, five hundred sixty-four".