79944809523 has 24 divisors (see below), whose sum is σ = 109767898800. Its totient is φ = 51724247040.

The previous prime is 79944809491. The next prime is 79944809537. The reversal of 79944809523 is 32590844997.

It is not a de Polignac number, because 79944809523 - 2⁵ = 79944809491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79944804523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4572903 + ... + 4590351.

It is an arithmetic number, because the mean of its divisors is an integer number (4573662450).

Almost surely, 2^79944809523 is an apocalyptic number.

79944809523 is a deficient number, since it is larger than the sum of its proper divisors (29823089277).

79944809523 is a wasteful number, since it uses less digits than its factorization.

79944809523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17879 (or 17686 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 79944809523 in words is "seventy-nine billion, nine hundred forty-four million, eight hundred nine thousand, five hundred twenty-three".