812628178631 has 2 divisors, whose sum is σ = 812628178632. Its totient is φ = 812628178630.

The previous prime is 812628178627. The next prime is 812628178669. The reversal of 812628178631 is 136871826218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812628178631 - 2² = 812628178627 is a prime.

It is a super-2 number, since 2×812628178631² (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 (812628171631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406314089315 + 406314089316.

It is an arithmetic number, because the mean of its divisors is an integer number (406314089316).

Almost surely, 2^812628178631 is an apocalyptic number.

812628178631 is a deficient number, since it is larger than the sum of its proper divisors (1).

812628178631 is an equidigital number, since it uses as much as digits as its factorization.

812628178631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 53.

The spelling of 812628178631 in words is "eight hundred twelve billion, six hundred twenty-eight million, one hundred seventy-eight thousand, six hundred thirty-one".