665277838964 has 12 divisors (see below), whose sum is σ = 1164245996004. Its totient is φ = 332636125824.

The previous prime is 665277838943. The next prime is 665277838969. The reversal of 665277838964 is 469838772566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 367609390864 + 297668448100 = 606308^2 + 545590^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665277838969) 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, 106949 + ... + 1158444.

It is an arithmetic number, because the mean of its divisors is an integer number (97020499667).

Almost surely, 2^665277838964 is an apocalyptic number.

It is an amenable number.

665277838964 is a deficient number, since it is larger than the sum of its proper divisors (498968157040).

665277838964 is a wasteful number, since it uses less digits than its factorization.

665277838964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396834 (or 1396832 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 71.

The spelling of 665277838964 in words is "six hundred sixty-five billion, two hundred seventy-seven million, eight hundred thirty-eight thousand, nine hundred sixty-four".