721635125671413 has 96 divisors (see below), whose sum is σ = 1113265310976000. Its totient is φ = 466842259468800.

The previous prime is 721635125671399. The next prime is 721635125671417. The reversal of 721635125671413 is 314176521536127.

721635125671413 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 3 + 51 + 2 + 567 + 14 + 13 = 666.

It is not a de Polignac number, because 721635125671413 - 2¹² = 721635125667317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721635125671413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721635125671417) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20530726563 + ... + 20530761711.

It is an arithmetic number, because the mean of its divisors is an integer number (11596513656000).

Almost surely, 2^{721635125671413} is an apocalyptic number.

It is an amenable number.

721635125671413 is a deficient number, since it is larger than the sum of its proper divisors (391630185304587).

721635125671413 is a wasteful number, since it uses less digits than its factorization.

721635125671413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46185 (or 46173 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The spelling of 721635125671413 in words is "seven hundred twenty-one trillion, six hundred thirty-five billion, one hundred twenty-five million, six hundred seventy-one thousand, four hundred thirteen".