721819370097 has 144 divisors (see below), whose sum is σ = 1309501839360. Its totient is φ = 380759569344.

The previous prime is 721819370087. The next prime is 721819370177. The reversal of 721819370097 is 790073918127.

721819370097 is a `hidden beast` number, since 7 + 2 + 181 + 9 + 370 + 0 + 97 = 666.

It is not a de Polignac number, because 721819370097 - 2²⁴ = 721802592881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721819370087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 166815348 + ... + 166819674.

Almost surely, 2^721819370097 is an apocalyptic number.

It is an amenable number.

721819370097 is a deficient number, since it is larger than the sum of its proper divisors (587682469263).

721819370097 is a wasteful number, since it uses less digits than its factorization.

721819370097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4862 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The spelling of 721819370097 in words is "seven hundred twenty-one billion, eight hundred nineteen million, three hundred seventy thousand, ninety-seven".