812318691955 has 4 divisors (see below), whose sum is σ = 974782430352. Its totient is φ = 649854953560.

The previous prime is 812318691949. The next prime is 812318692021. The reversal of 812318691955 is 559196813218.

It is a happy number.

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

It is not a de Polignac number, because 812318691955 - 2²³ = 812310303347 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812318691955.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81231869191 + ... + 81231869200.

It is an arithmetic number, because the mean of its divisors is an integer number (243695607588).

Almost surely, 2^812318691955 is an apocalyptic number.

812318691955 is a deficient number, since it is larger than the sum of its proper divisors (162463738397).

812318691955 is a wasteful number, since it uses less digits than its factorization.

812318691955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162463738396.

The product of its digits is 4665600, while the sum is 58.

The spelling of 812318691955 in words is "eight hundred twelve billion, three hundred eighteen million, six hundred ninety-one thousand, nine hundred fifty-five".