721817347023 has 6 divisors (see below), whose sum is σ = 1042625056824. Its totient is φ = 481211564676.

The previous prime is 721817347003. The next prime is 721817347037. The reversal of 721817347023 is 320743718127.

721817347023 is a `hidden beast` number, since 7 + 2 + 1 + 8 + 173 + 470 + 2 + 3 = 666.

It is not a de Polignac number, because 721817347023 - 2⁹ = 721817346511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721817347023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721817347003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40100963715 + ... + 40100963732.

It is an arithmetic number, because the mean of its divisors is an integer number (173770842804).

Almost surely, 2^721817347023 is an apocalyptic number.

721817347023 is a deficient number, since it is larger than the sum of its proper divisors (320807709801).

721817347023 is a wasteful number, since it uses less digits than its factorization.

721817347023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80201927453 (or 80201927450 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 721817347023 in words is "seven hundred twenty-one billion, eight hundred seventeen million, three hundred forty-seven thousand, twenty-three".