721658670316 has 12 divisors (see below), whose sum is σ = 1263070731888. Its totient is φ = 360781318352.

The previous prime is 721658670311. The next prime is 721658670347. The reversal of 721658670316 is 613076856127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (721658670311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11970376 + ... + 12030511.

It is an arithmetic number, because the mean of its divisors is an integer number (105255894324).

Almost surely, 2^721658670316 is an apocalyptic number.

It is an amenable number.

721658670316 is a deficient number, since it is larger than the sum of its proper divisors (541412061572).

721658670316 is a wasteful number, since it uses less digits than its factorization.

721658670316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24008408 (or 24008406 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 721658670316 in words is "seven hundred twenty-one billion, six hundred fifty-eight million, six hundred seventy thousand, three hundred sixteen".