65699563968 has 168 divisors, whose sum is σ = 195553870512. Its totient is φ = 21870342144.

The previous prime is 65699563933. The next prime is 65699563973. The reversal of 65699563968 is 86936599656.

65699563968 is a `hidden beast` number, since 6 + 56 + 9 + 9 + 563 + 9 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 65699563896 and 65699563905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13636696 + ... + 13641512.

It is an arithmetic number, because the mean of its divisors is an integer number (1164011134).

Almost surely, 2^65699563968 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 65699563968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97776935256).

65699563968 is an abundant number, since it is smaller than the sum of its proper divisors (129854306544).

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

65699563968 is an equidigital number, since it uses as much as digits as its factorization.

65699563968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721 (or 5699 counting only the distinct ones).

The product of its digits is 566870400, while the sum is 72.

The spelling of 65699563968 in words is "sixty-five billion, six hundred ninety-nine million, five hundred sixty-three thousand, nine hundred sixty-eight".