811371688417 has 2 divisors, whose sum is σ = 811371688418. Its totient is φ = 811371688416.

The previous prime is 811371688381. The next prime is 811371688433. The reversal of 811371688417 is 714886173118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528261497856 + 283110190561 = 726816^2 + 532081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811371688417 is a prime.

It is not a weakly prime, because it can be changed into another prime (811371688487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405685844208 + 405685844209.

It is an arithmetic number, because the mean of its divisors is an integer number (405685844209).

Almost surely, 2^811371688417 is an apocalyptic number.

It is an amenable number.

811371688417 is a deficient number, since it is larger than the sum of its proper divisors (1).

811371688417 is an equidigital number, since it uses as much as digits as its factorization.

811371688417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 55.

The spelling of 811371688417 in words is "eight hundred eleven billion, three hundred seventy-one million, six hundred eighty-eight thousand, four hundred seventeen".