721534223063536 has 20 divisors (see below), whose sum is σ = 1398006873786600. Its totient is φ = 360758255634752.

The previous prime is 721534223063491. The next prime is 721534223063561. The reversal of 721534223063536 is 635360322435127.

It is a happy number.

It is a super-2 number, since 2×721534223063536² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 552821371 + ... + 554125018.

It is an arithmetic number, because the mean of its divisors is an integer number (69900343689330).

Almost surely, 2^{721534223063536} is an apocalyptic number.

It is an amenable number.

721534223063536 is a deficient number, since it is larger than the sum of its proper divisors (676472650723064).

721534223063536 is a wasteful number, since it uses less digits than its factorization.

721534223063536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106987136 (or 1106987130 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 52.

The spelling of 721534223063536 in words is "seven hundred twenty-one trillion, five hundred thirty-four billion, two hundred twenty-three million, sixty-three thousand, five hundred thirty-six".