791621444881 has 8 divisors (see below), whose sum is σ = 806591191464. Its totient is φ = 776652938880.

The previous prime is 791621444857. The next prime is 791621444897. The reversal of 791621444881 is 188444126197.

It can be written as a sum of positive squares in 4 ways, for example, as 46457856 + 791574987025 = 6816^2 + 889705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 791621444881 - 2²⁹ = 791084573969 is a prime.

It is a super-2 number, since 2×791621444881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791621448881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032571 + ... + 1627711.

It is an arithmetic number, because the mean of its divisors is an integer number (100823898933).

Almost surely, 2^791621444881 is an apocalyptic number.

It is an amenable number.

791621444881 is a deficient number, since it is larger than the sum of its proper divisors (14969746583).

791621444881 is a wasteful number, since it uses less digits than its factorization.

791621444881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620291.

The product of its digits is 3096576, while the sum is 55.

The spelling of 791621444881 in words is "seven hundred ninety-one billion, six hundred twenty-one million, four hundred forty-four thousand, eight hundred eighty-one".