721513139116 has 24 divisors (see below), whose sum is σ = 1574210486016. Its totient is φ = 281109015120.

The previous prime is 721513139101. The next prime is 721513139129. The reversal of 721513139116 is 611931315127.

It is a super-2 number, since 2×721513139116² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1171287256 + ... + 1171287871.

It is an arithmetic number, because the mean of its divisors is an integer number (65592103584).

Almost surely, 2^721513139116 is an apocalyptic number.

It is an amenable number.

721513139116 is an abundant number, since it is smaller than the sum of its proper divisors (852697346900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721513139116 is a wasteful number, since it uses less digits than its factorization.

721513139116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342575149 (or 2342575147 counting only the distinct ones).

The product of its digits is 34020, while the sum is 40.

The spelling of 721513139116 in words is "seven hundred twenty-one billion, five hundred thirteen million, one hundred thirty-nine thousand, one hundred sixteen".