721555057064 has 16 divisors (see below), whose sum is σ = 1362648940800. Its totient is φ = 358182006192.

The previous prime is 721555057039. The next prime is 721555057087. The reversal of 721555057064 is 460750555127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324439112 + ... + 324441335.

It is an arithmetic number, because the mean of its divisors is an integer number (85165558800).

Almost surely, 2^721555057064 is an apocalyptic number.

It is an amenable number.

721555057064 is a deficient number, since it is larger than the sum of its proper divisors (641093883736).

721555057064 is a wasteful number, since it uses less digits than its factorization.

721555057064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648880592 (or 648880588 counting only the distinct ones).

The product of its (nonzero) digits is 1470000, while the sum is 47.

The spelling of 721555057064 in words is "seven hundred twenty-one billion, five hundred fifty-five million, fifty-seven thousand, sixty-four".