811113961381957 has 2 divisors, whose sum is σ = 811113961381958. Its totient is φ = 811113961381956.

The previous prime is 811113961381873. The next prime is 811113961381961. The reversal of 811113961381957 is 759183169311118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755092912934116 + 56021048447841 = 27478954^2 + 7484721^2 .

It is a cyclic number.

It is not a de Polignac number, because 811113961381957 - 2²⁷ = 811113827164229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811113961381057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405556980690978 + 405556980690979.

It is an arithmetic number, because the mean of its divisors is an integer number (405556980690979).

Almost surely, 2^{811113961381957} is an apocalyptic number.

It is an amenable number.

811113961381957 is a deficient number, since it is larger than the sum of its proper divisors (1).

811113961381957 is an equidigital number, since it uses as much as digits as its factorization.

811113961381957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 64.

The spelling of 811113961381957 in words is "eight hundred eleven trillion, one hundred thirteen billion, nine hundred sixty-one million, three hundred eighty-one thousand, nine hundred fifty-seven".