660561570216 has 48 divisors (see below), whose sum is σ = 1789141454100. Its totient is φ = 220172355072.

The previous prime is 660561570197. The next prime is 660561570223. The reversal of 660561570216 is 612075165066.

660561570216 is a `hidden beast` number, since 6 + 6 + 0 + 5 + 61 + 570 + 2 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 628129162116 + 32432408100 = 792546^2 + 180090^2 .

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, 794170 + ... + 1397078.

Almost surely, 2^660561570216 is an apocalyptic number.

It is an amenable number.

660561570216 is an abundant number, since it is smaller than the sum of its proper divisors (1128579883884).

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

660561570216 is a wasteful number, since it uses less digits than its factorization.

660561570216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618138 (or 618131 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 660561570216 in words is "six hundred sixty billion, five hundred sixty-one million, five hundred seventy thousand, two hundred sixteen".