818077917893 has 2 divisors, whose sum is σ = 818077917894. Its totient is φ = 818077917892.

The previous prime is 818077917887. The next prime is 818077917901. The reversal of 818077917893 is 398719770818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 707822707684 + 110255210209 = 841322^2 + 332047^2 .

It is a cyclic number.

It is not a de Polignac number, because 818077917893 - 2⁸ = 818077917637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818077917493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409038958946 + 409038958947.

It is an arithmetic number, because the mean of its divisors is an integer number (409038958947).

Almost surely, 2^818077917893 is an apocalyptic number.

It is an amenable number.

818077917893 is a deficient number, since it is larger than the sum of its proper divisors (1).

818077917893 is an equidigital number, since it uses as much as digits as its factorization.

818077917893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42674688, while the sum is 68.

The spelling of 818077917893 in words is "eight hundred eighteen billion, seventy-seven million, nine hundred seventeen thousand, eight hundred ninety-three".