65687660864 has 28 divisors (see below), whose sum is σ = 148970231904. Its totient is φ = 28151854464.

The previous prime is 65687660821. The next prime is 65687660869. The reversal of 65687660864 is 46806678656.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 65687660797 and 65687660806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65687660869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73311674 + ... + 73312569.

Almost surely, 2^65687660864 is an apocalyptic number.

65687660864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65687660864 is an abundant number, since it is smaller than the sum of its proper divisors (83282571040).

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

65687660864 is a wasteful number, since it uses less digits than its factorization.

65687660864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146624262 (or 146624252 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 62.

The spelling of 65687660864 in words is "sixty-five billion, six hundred eighty-seven million, six hundred sixty thousand, eight hundred sixty-four".