65694857664 has 112 divisors (see below), whose sum is σ = 184430822400. Its totient is φ = 20566634496.

The previous prime is 65694857659. The next prime is 65694857699. The reversal of 65694857664 is 46675849656.

It is a junction number, because it is equal to n+sod(n) for n = 65694857595 and 65694857604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1542447 + ... + 1584465.

Almost surely, 2^65694857664 is an apocalyptic number.

65694857664 is a gapful number since it is divisible by the number (64) 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 65694857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92215411200).

65694857664 is an abundant number, since it is smaller than the sum of its proper divisors (118735964736).

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

65694857664 is a wasteful number, since it uses less digits than its factorization.

65694857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42530 (or 42520 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 66.

The spelling of 65694857664 in words is "sixty-five billion, six hundred ninety-four million, eight hundred fifty-seven thousand, six hundred sixty-four".