665658710964 has 192 divisors, whose sum is σ = 1970342778880. Its totient is φ = 192853509120.

The previous prime is 665658710963. The next prime is 665658710993. The reversal of 665658710964 is 469017856566.

665658710964 is a `hidden beast` number, since 6 + 6 + 565 + 8 + 7 + 1 + 0 + 9 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665658710963) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1403712 + ... + 1817064.

Almost surely, 2^665658710964 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 665658710964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985171389440).

665658710964 is an abundant number, since it is smaller than the sum of its proper divisors (1304684067916).

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

665658710964 is a wasteful number, since it uses less digits than its factorization.

665658710964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413447 (or 413439 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 665658710964 in words is "six hundred sixty-five billion, six hundred fifty-eight million, seven hundred ten thousand, nine hundred sixty-four".