665605522736 has 80 divisors (see below), whose sum is σ = 1620486758400. Its totient is φ = 257284823040.

The previous prime is 665605522727. The next prime is 665605522741. The reversal of 665605522736 is 637225506566.

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 15 ways as a sum of consecutive naturals, for example, 1970561 + ... + 2283488.

It is an arithmetic number, because the mean of its divisors is an integer number (20256084480).

Almost surely, 2^665605522736 is an apocalyptic number.

It is an amenable number.

665605522736 is an abundant number, since it is smaller than the sum of its proper divisors (954881235664).

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

665605522736 is a wasteful number, since it uses less digits than its factorization.

665605522736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254202 (or 4254196 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 53.

The spelling of 665605522736 in words is "six hundred sixty-five billion, six hundred five million, five hundred twenty-two thousand, seven hundred thirty-six".