665294710336 has 21 divisors (see below), whose sum is σ = 1320207139489. Its totient is φ = 332644092544.

The previous prime is 665294710313. The next prime is 665294710363. The reversal of 665294710336 is 633017492566.

It is a happy number.

The square root of 665294710336 is 815656.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 660188750400 + 5105959936 = 812520^2 + 71456^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6474270 + ... + 6576226.

Almost surely, 2^665294710336 is an apocalyptic number.

665294710336 is the 815656-th square number.

It is an amenable number.

665294710336 is a deficient number, since it is larger than the sum of its proper divisors (654912429153).

665294710336 is an frugal number, since it uses more digits than its factorization.

665294710336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203926 (or 101959 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 665294710336 in words is "six hundred sixty-five billion, two hundred ninety-four million, seven hundred ten thousand, three hundred thirty-six".