721225986768 has 120 divisors (see below), whose sum is σ = 2392214680128. Its totient is φ = 206064559872.

The previous prime is 721225986763. The next prime is 721225986791. The reversal of 721225986768 is 867689522127.

It is a super-2 number, since 2×721225986768² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721225986763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13222821 + ... + 13277252.

Almost surely, 2^721225986768 is an apocalyptic number.

It is an amenable number.

721225986768 is an abundant number, since it is smaller than the sum of its proper divisors (1670988693360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721225986768 is a wasteful number, since it uses less digits than its factorization.

721225986768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26500103 (or 26500085 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 721225986768 in words is "seven hundred twenty-one billion, two hundred twenty-five million, nine hundred eighty-six thousand, seven hundred sixty-eight".