812166501331 has 2 divisors, whose sum is σ = 812166501332. Its totient is φ = 812166501330.

The previous prime is 812166501317. The next prime is 812166501359. The reversal of 812166501331 is 133105661218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812166501331 - 2⁷ = 812166501203 is a prime.

It is a super-2 number, since 2×812166501331² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (812166501031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406083250665 + 406083250666.

It is an arithmetic number, because the mean of its divisors is an integer number (406083250666).

Almost surely, 2^812166501331 is an apocalyptic number.

812166501331 is a deficient number, since it is larger than the sum of its proper divisors (1).

812166501331 is an equidigital number, since it uses as much as digits as its factorization.

812166501331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 812166501331 in words is "eight hundred twelve billion, one hundred sixty-six million, five hundred one thousand, three hundred thirty-one".