721665056670036 has 24 divisors (see below), whose sum is σ = 1723045251585504. Its totient is φ = 234960716124960.

The previous prime is 721665056670029. The next prime is 721665056670121. The reversal of 721665056670036 is 630076650566127.

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, 699287845095 + ... + 699287846126.

It is an arithmetic number, because the mean of its divisors is an integer number (71793552149396).

Almost surely, 2^{721665056670036} is an apocalyptic number.

It is an amenable number.

721665056670036 is an abundant number, since it is smaller than the sum of its proper divisors (1001380194915468).

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

721665056670036 is a wasteful number, since it uses less digits than its factorization.

721665056670036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398575691271 (or 1398575691269 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 60.

The spelling of 721665056670036 in words is "seven hundred twenty-one trillion, six hundred sixty-five billion, fifty-six million, six hundred seventy thousand, thirty-six".