665274034742556 has 24 divisors (see below), whose sum is σ = 1552306520431744. Its totient is φ = 221757948814320.

The previous prime is 665274034742549. The next prime is 665274034742573. The reversal of 665274034742556 is 655247430472566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59310321 + ... + 69629463.

Almost surely, 2^{665274034742556} is an apocalyptic number.

It is an amenable number.

665274034742556 is an abundant number, since it is smaller than the sum of its proper divisors (887032485689188).

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

665274034742556 is a wasteful number, since it uses less digits than its factorization.

665274034742556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15691641 (or 15691639 counting only the distinct ones).

The product of its (nonzero) digits is 1016064000, while the sum is 66.

The spelling of 665274034742556 in words is "six hundred sixty-five trillion, two hundred seventy-four billion, thirty-four million, seven hundred forty-two thousand, five hundred fifty-six".