665936354720 has 96 divisors (see below), whose sum is σ = 1936338058368. Its totient is φ = 210757874688.

The previous prime is 665936354711. The next prime is 665936354723. The reversal of 665936354720 is 27453639566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (665936354723) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22854134 + ... + 22883253.

It is an arithmetic number, because the mean of its divisors is an integer number (20170188108).

Almost surely, 2^665936354720 is an apocalyptic number.

It is an amenable number.

665936354720 is an abundant number, since it is smaller than the sum of its proper divisors (1270401703648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665936354720 is a wasteful number, since it uses less digits than its factorization.

665936354720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45737422 (or 45737414 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 56.

The spelling of 665936354720 in words is "six hundred sixty-five billion, nine hundred thirty-six million, three hundred fifty-four thousand, seven hundred twenty".