721665056670030 has 96 divisors (see below), whose sum is σ = 2074944312586080. Its totient is φ = 172552541552640.

The previous prime is 721665056670029. The next prime is 721665056670121. The reversal of 721665056670030 is 30076650566127.

721665056670030 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 6 + 5 + 0 + 566 + 70 + 0 + 3 + 0 = 666.

It is a super-2 number, since 2×721665056670030² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 4992767475 + ... + 4992912014.

It is an arithmetic number, because the mean of its divisors is an integer number (21614003256105).

Almost surely, 2^{721665056670030} is an apocalyptic number.

721665056670030 is an abundant number, since it is smaller than the sum of its proper divisors (1353279255916050).

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

721665056670030 is a wasteful number, since it uses less digits than its factorization.

721665056670030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985679586 (or 9985679583 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 54.

The spelling of 721665056670030 in words is "seven hundred twenty-one trillion, six hundred sixty-five billion, fifty-six million, six hundred seventy thousand, thirty".