65660637312 has 384 divisors, whose sum is σ = 200691691200. Its totient is φ = 21364715520.

The previous prime is 65660637307. The next prime is 65660637313. The reversal of 65660637312 is 21373606656.

65660637312 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 0 + 637 + 3 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×65660637312² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65660637313) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 362765862 + ... + 362766042.

Almost surely, 2^65660637312 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 65660637312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100345845600).

65660637312 is an abundant number, since it is smaller than the sum of its proper divisors (135031053888).

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

65660637312 is a wasteful number, since it uses less digits than its factorization.

65660637312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The spelling of 65660637312 in words is "sixty-five billion, six hundred sixty million, six hundred thirty-seven thousand, three hundred twelve".