812218456871 has 2 divisors, whose sum is σ = 812218456872. Its totient is φ = 812218456870.

The previous prime is 812218456859. The next prime is 812218456877. The reversal of 812218456871 is 178654812218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812218456871 - 2¹⁰ = 812218455847 is a prime.

It is a super-2 number, since 2×812218456871² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812218456877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406109228435 + 406109228436.

It is an arithmetic number, because the mean of its divisors is an integer number (406109228436).

Almost surely, 2^812218456871 is an apocalyptic number.

812218456871 is a deficient number, since it is larger than the sum of its proper divisors (1).

812218456871 is an equidigital number, since it uses as much as digits as its factorization.

812218456871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1720320, while the sum is 53.

The spelling of 812218456871 in words is "eight hundred twelve billion, two hundred eighteen million, four hundred fifty-six thousand, eight hundred seventy-one".