66511567659 has 16 divisors (see below), whose sum is σ = 88788960000. Its totient is φ = 44287648416.

The previous prime is 66511567651. The next prime is 66511567691. The reversal of 66511567659 is 95676511566.

It is not a de Polignac number, because 66511567659 - 2³ = 66511567651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66511567599 and 66511567608.

It is not an unprimeable number, because it can be changed into a prime (66511567651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12539602 + ... + 12544904.

It is an arithmetic number, because the mean of its divisors is an integer number (5549310000).

Almost surely, 2^66511567659 is an apocalyptic number.

66511567659 is a deficient number, since it is larger than the sum of its proper divisors (22277392341).

66511567659 is a wasteful number, since it uses less digits than its factorization.

66511567659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9554.

The product of its digits is 10206000, while the sum is 57.

The spelling of 66511567659 in words is "sixty-six billion, five hundred eleven million, five hundred sixty-seven thousand, six hundred fifty-nine".