721532741613616 has 80 divisors (see below), whose sum is σ = 1409416379864064. Its totient is φ = 357824610816512.

The previous prime is 721532741613611. The next prime is 721532741613667. The reversal of 721532741613616 is 616316147235127.

It is a super-2 number, since 2×721532741613616² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721532741613611) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 19753389945 + ... + 19753426471.

Almost surely, 2^{721532741613616} is an apocalyptic number.

It is an amenable number.

721532741613616 is a deficient number, since it is larger than the sum of its proper divisors (687883638250448).

721532741613616 is a wasteful number, since it uses less digits than its factorization.

721532741613616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57178 (or 57172 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 55.

The spelling of 721532741613616 in words is "seven hundred twenty-one trillion, five hundred thirty-two billion, seven hundred forty-one million, six hundred thirteen thousand, six hundred sixteen".