813899872079 has 6 divisors (see below), whose sum is σ = 946781483904. Its totient is φ = 697628461740.

The previous prime is 813899872069. The next prime is 813899872081. The reversal of 813899872079 is 970278998318.

It is not a de Polignac number, because 813899872079 - 2⁴ = 813899872063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813899872069) 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, 8305100687 + ... + 8305100784.

It is an arithmetic number, because the mean of its divisors is an integer number (157796913984).

Almost surely, 2^813899872079 is an apocalyptic number.

813899872079 is a deficient number, since it is larger than the sum of its proper divisors (132881611825).

813899872079 is a wasteful number, since it uses less digits than its factorization.

813899872079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16610201485 (or 16610201478 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 71.

The spelling of 813899872079 in words is "eight hundred thirteen billion, eight hundred ninety-nine million, eight hundred seventy-two thousand, seventy-nine".