665136736023656 has 32 divisors (see below), whose sum is σ = 1413752171714400. Its totient is φ = 290829018179520.

The previous prime is 665136736023583. The next prime is 665136736023667. The reversal of 665136736023656 is 656320637631566.

It is a junction number, because it is equal to n+sod(n) for n = 665136736023592 and 665136736023601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168303827990 + ... + 168303831941.

It is an arithmetic number, because the mean of its divisors is an integer number (44179755366075).

Almost surely, 2^{665136736023656} is an apocalyptic number.

It is an amenable number.

665136736023656 is an abundant number, since it is smaller than the sum of its proper divisors (748615435690744).

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

665136736023656 is a wasteful number, since it uses less digits than its factorization.

665136736023656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336607659969 (or 336607659965 counting only the distinct ones).

The product of its (nonzero) digits is 440899200, while the sum is 65.

The spelling of 665136736023656 in words is "six hundred sixty-five trillion, one hundred thirty-six billion, seven hundred thirty-six million, twenty-three thousand, six hundred fifty-six".