721294901918 has 8 divisors (see below), whose sum is σ = 1089203711400. Its totient is φ = 358226998120.

The previous prime is 721294901897. The next prime is 721294901923. The reversal of 721294901918 is 819109492127.

It is a happy number.

721294901918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 721294901918.

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, 1210226048 + ... + 1210226643.

It is an arithmetic number, because the mean of its divisors is an integer number (136150463925).

Almost surely, 2^721294901918 is an apocalyptic number.

721294901918 is a deficient number, since it is larger than the sum of its proper divisors (367908809482).

721294901918 is a wasteful number, since it uses less digits than its factorization.

721294901918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420452842.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 721294901918 in words is "seven hundred twenty-one billion, two hundred ninety-four million, nine hundred one thousand, nine hundred eighteen".