721410943656 has 32 divisors (see below), whose sum is σ = 1942260233760. Its totient is φ = 221972597952.

The previous prime is 721410943633. The next prime is 721410943661. The reversal of 721410943656 is 656349014127.

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

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, 1156106970 + ... + 1156107593.

It is an arithmetic number, because the mean of its divisors is an integer number (60695632305).

Almost surely, 2^721410943656 is an apocalyptic number.

It is an amenable number.

721410943656 is an abundant number, since it is smaller than the sum of its proper divisors (1220849290104).

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

721410943656 is a wasteful number, since it uses less digits than its factorization.

721410943656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312214585 (or 2312214581 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 721410943656 in words is "seven hundred twenty-one billion, four hundred ten million, nine hundred forty-three thousand, six hundred fifty-six".