665168278724 has 12 divisors (see below), whose sum is σ = 1164098029584. Its totient is φ = 332568841704.

The previous prime is 665168278711. The next prime is 665168278741. The reversal of 665168278724 is 427872861566.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3726302 + ... + 3900725.

It is an arithmetic number, because the mean of its divisors is an integer number (97008169132).

Almost surely, 2^665168278724 is an apocalyptic number.

It is an amenable number.

665168278724 is a deficient number, since it is larger than the sum of its proper divisors (498929750860).

665168278724 is a wasteful number, since it uses less digits than its factorization.

665168278724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648834 (or 7648832 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 62.

The spelling of 665168278724 in words is "six hundred sixty-five billion, one hundred sixty-eight million, two hundred seventy-eight thousand, seven hundred twenty-four".