721403412568 has 16 divisors (see below), whose sum is σ = 1353226519080. Its totient is φ = 360543007488.

The previous prime is 721403412557. The next prime is 721403412601. The reversal of 721403412568 is 865214304127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19818030 + ... + 19854397.

Almost surely, 2^721403412568 is an apocalyptic number.

It is an amenable number.

721403412568 is a deficient number, since it is larger than the sum of its proper divisors (631823106512).

721403412568 is a wasteful number, since it uses less digits than its factorization.

721403412568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39674706 (or 39674702 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 721403412568 in words is "seven hundred twenty-one billion, four hundred three million, four hundred twelve thousand, five hundred sixty-eight".