66565715613 has 8 divisors (see below), whose sum is σ = 88755760800. Its totient is φ = 44376407088.

The previous prime is 66565715609. The next prime is 66565715653. The reversal of 66565715613 is 31651756566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66565715613 - 2² = 66565715609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565715603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81378 + ... + 373836.

It is an arithmetic number, because the mean of its divisors is an integer number (11094470100).

Almost surely, 2^66565715613 is an apocalyptic number.

It is an amenable number.

66565715613 is a deficient number, since it is larger than the sum of its proper divisors (22190045187).

66565715613 is a wasteful number, since it uses less digits than its factorization.

66565715613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368331.

The product of its digits is 3402000, while the sum is 51.

The spelling of 66565715613 in words is "sixty-six billion, five hundred sixty-five million, seven hundred fifteen thousand, six hundred thirteen".