65599764516 has 240 divisors, whose sum is σ = 207975280128. Its totient is φ = 17757273600.

The previous prime is 65599764511. The next prime is 65599764541. The reversal of 65599764516 is 61546799556.

65599764516 is a `hidden beast` number, since 6 + 5 + 59 + 9 + 7 + 64 + 516 = 666.

It is not an unprimeable number, because it can be changed into a prime (65599764511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1413456 + ... + 1459128.

Almost surely, 2^65599764516 is an apocalyptic number.

65599764516 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65599764516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103987640064).

65599764516 is an abundant number, since it is smaller than the sum of its proper divisors (142375515612).

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

65599764516 is a wasteful number, since it uses less digits than its factorization.

65599764516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45744 (or 45733 counting only the distinct ones).

The product of its digits is 61236000, while the sum is 63.

The spelling of 65599764516 in words is "sixty-five billion, five hundred ninety-nine million, seven hundred sixty-four thousand, five hundred sixteen".