813220097975 has 12 divisors (see below), whose sum is σ = 1014431207664. Its totient is φ = 646680409920.

The previous prime is 813220097951. The next prime is 813220098011. The reversal of 813220097975 is 579790022318.

It is a happy number.

It is not a de Polignac number, because 813220097975 - 2¹⁶ = 813220032439 is a prime.

It is a super-2 number, since 2×813220097975² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97387454 + ... + 97395803.

It is an arithmetic number, because the mean of its divisors is an integer number (84535933972).

Almost surely, 2^813220097975 is an apocalyptic number.

813220097975 is a deficient number, since it is larger than the sum of its proper divisors (201211109689).

813220097975 is a wasteful number, since it uses less digits than its factorization.

813220097975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194783434 (or 194783429 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 813220097975 in words is "eight hundred thirteen billion, two hundred twenty million, ninety-seven thousand, nine hundred seventy-five".