666601065560 has 32 divisors (see below), whose sum is σ = 1551571448400. Its totient is φ = 257445928320.

The previous prime is 666601065553. The next prime is 666601065569. The reversal of 666601065560 is 65560106666.

It is a super-2 number, since 2×666601065560² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666601065569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287326886 + ... + 287329205.

Almost surely, 2^666601065560 is an apocalyptic number.

It is an amenable number.

666601065560 is an abundant number, since it is smaller than the sum of its proper divisors (884970382840).

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

666601065560 is a wasteful number, since it uses less digits than its factorization.

666601065560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574656131 (or 574656127 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 666601065560 in words is "six hundred sixty-six billion, six hundred one million, sixty-five thousand, five hundred sixty".