665707613408 has 24 divisors (see below), whose sum is σ = 1317264728472. Its totient is φ = 331164190336.

The previous prime is 665707613393. The next prime is 665707613413. The reversal of 665707613408 is 804316707566.

It is a self number, because there is not a number n which added to its sum of digits gives 665707613408.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 52794110 + ... + 52806717.

It is an arithmetic number, because the mean of its divisors is an integer number (54886030353).

Almost surely, 2^665707613408 is an apocalyptic number.

It is an amenable number.

665707613408 is a deficient number, since it is larger than the sum of its proper divisors (651557115064).

665707613408 is a wasteful number, since it uses less digits than its factorization.

665707613408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105601034 (or 105601026 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 665707613408 in words is "six hundred sixty-five billion, seven hundred seven million, six hundred thirteen thousand, four hundred eight".