721751052446625 has 32 divisors (see below), whose sum is σ = 1207090166375808. Its totient is φ = 382979915438400.

The previous prime is 721751052446623. The next prime is 721751052446647. The reversal of 721751052446625 is 526644250157127.

It is a happy number.

It is not a de Polignac number, because 721751052446625 - 2¹ = 721751052446623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721751052446623) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4884874027 + ... + 4885021776.

It is an arithmetic number, because the mean of its divisors is an integer number (37721567699244).

Almost surely, 2^{721751052446625} is an apocalyptic number.

721751052446625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721751052446625 is a deficient number, since it is larger than the sum of its proper divisors (485339113929183).

721751052446625 is a wasteful number, since it uses less digits than its factorization.

721751052446625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9769896018 (or 9769896008 counting only the distinct ones).

The product of its (nonzero) digits is 28224000, while the sum is 57.

The spelling of 721751052446625 in words is "seven hundred twenty-one trillion, seven hundred fifty-one billion, fifty-two million, four hundred forty-six thousand, six hundred twenty-five".