721690538997 has 32 divisors (see below), whose sum is σ = 989158993920. Its totient is φ = 467810925120.

The previous prime is 721690538929. The next prime is 721690539047. The reversal of 721690538997 is 799835096127.

It is not a de Polignac number, because 721690538997 - 2⁸ = 721690538741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721690538497) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 76275847 + ... + 76285307.

It is an arithmetic number, because the mean of its divisors is an integer number (30911218560).

Almost surely, 2^721690538997 is an apocalyptic number.

It is an amenable number.

721690538997 is a deficient number, since it is larger than the sum of its proper divisors (267468454923).

721690538997 is a wasteful number, since it uses less digits than its factorization.

721690538997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993.

The product of its (nonzero) digits is 51438240, while the sum is 66.

The spelling of 721690538997 in words is "seven hundred twenty-one billion, six hundred ninety million, five hundred thirty-eight thousand, nine hundred ninety-seven".