721944839452319 has 4 divisors (see below), whose sum is σ = 825079816516944. Its totient is φ = 618809862387696.

The previous prime is 721944839452307. The next prime is 721944839452321. The reversal of 721944839452319 is 913254938449127.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 721944839452319 - 2³² = 721940544485023 is a prime.

It is a super-2 number, since 2×721944839452319² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721944839452019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51567488532302 + ... + 51567488532315.

It is an arithmetic number, because the mean of its divisors is an integer number (206269954129236).

Almost surely, 2^{721944839452319} is an apocalyptic number.

721944839452319 is a deficient number, since it is larger than the sum of its proper divisors (103134977064625).

721944839452319 is a wasteful number, since it uses less digits than its factorization.

721944839452319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103134977064624.

The product of its digits is 470292480, while the sum is 71.

The spelling of 721944839452319 in words is "seven hundred twenty-one trillion, nine hundred forty-four billion, eight hundred thirty-nine million, four hundred fifty-two thousand, three hundred nineteen".