721514316655 has 16 divisors (see below), whose sum is σ = 946136951424. Its totient is φ = 523843730080.

The previous prime is 721514316647. The next prime is 721514316703. The reversal of 721514316655 is 556613415127.

It is not a de Polignac number, because 721514316655 - 2³ = 721514316647 is a prime.

It is a super-2 number, since 2×721514316655² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11141857 + ... + 11206426.

It is an arithmetic number, because the mean of its divisors is an integer number (59133559464).

Almost surely, 2^721514316655 is an apocalyptic number.

721514316655 is a deficient number, since it is larger than the sum of its proper divisors (224622634769).

721514316655 is a wasteful number, since it uses less digits than its factorization.

721514316655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22348886.

The product of its digits is 756000, while the sum is 46.

The spelling of 721514316655 in words is "seven hundred twenty-one billion, five hundred fourteen million, three hundred sixteen thousand, six hundred fifty-five".