665717167604 has 12 divisors (see below), whose sum is σ = 1175892941664. Its totient is φ = 329747755704.

The previous prime is 665717167553. The next prime is 665717167607. The reversal of 665717167604 is 406761717566.

It is a self number, because there is not a number n which added to its sum of digits gives 665717167604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665717167607) 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, 777706544 + ... + 777707399.

It is an arithmetic number, because the mean of its divisors is an integer number (97991078472).

Almost surely, 2^665717167604 is an apocalyptic number.

It is an amenable number.

665717167604 is a deficient number, since it is larger than the sum of its proper divisors (510175774060).

665717167604 is a wasteful number, since it uses less digits than its factorization.

665717167604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555414054 (or 1555414052 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 665717167604 in words is "six hundred sixty-five billion, seven hundred seventeen million, one hundred sixty-seven thousand, six hundred four".