665513315567 has 8 divisors (see below), whose sum is σ = 689405411520. Its totient is φ = 641985984640.

The previous prime is 665513315501. The next prime is 665513315633. The reversal of 665513315567 is 765513315566.

It is an interprime number because it is at equal distance from previous prime (665513315501) and next prime (665513315633).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665513315567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665513395567) 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, 91187543 + ... + 91194840.

It is an arithmetic number, because the mean of its divisors is an integer number (86175676440).

Almost surely, 2^665513315567 is an apocalyptic number.

665513315567 is a deficient number, since it is larger than the sum of its proper divisors (23892095953).

665513315567 is a wasteful number, since it uses less digits than its factorization.

665513315567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182382513.

The product of its digits is 8505000, while the sum is 53.

Subtracting 665513315567 from its reverse (765513315566), we obtain a palindrome (99999999999).

The spelling of 665513315567 in words is "six hundred sixty-five billion, five hundred thirteen million, three hundred fifteen thousand, five hundred sixty-seven".