721412565418 has 64 divisors (see below), whose sum is σ = 1148230287360. Its totient is φ = 339472425600.

The previous prime is 721412565409. The next prime is 721412565421. The reversal of 721412565418 is 814565214127.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182958355 + ... + 182962297.

It is an arithmetic number, because the mean of its divisors is an integer number (17941098240).

Almost surely, 2^721412565418 is an apocalyptic number.

721412565418 is a deficient number, since it is larger than the sum of its proper divisors (426817721942).

721412565418 is a wasteful number, since it uses less digits than its factorization.

721412565418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603.

The product of its digits is 537600, while the sum is 46.

The spelling of 721412565418 in words is "seven hundred twenty-one billion, four hundred twelve million, five hundred sixty-five thousand, four hundred eighteen".