818608915253 has 2 divisors, whose sum is σ = 818608915254. Its totient is φ = 818608915252.

The previous prime is 818608915211. The next prime is 818608915283. The reversal of 818608915253 is 352519806818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645159155524 + 173449759729 = 803218^2 + 416473^2 .

It is a cyclic number.

It is not a de Polignac number, because 818608915253 - 2⁸ = 818608914997 is a prime.

It is a super-2 number, since 2×818608915253² (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 (818608915283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409304457626 + 409304457627.

It is an arithmetic number, because the mean of its divisors is an integer number (409304457627).

Almost surely, 2^818608915253 is an apocalyptic number.

It is an amenable number.

818608915253 is a deficient number, since it is larger than the sum of its proper divisors (1).

818608915253 is an equidigital number, since it uses as much as digits as its factorization.

818608915253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The spelling of 818608915253 in words is "eight hundred eighteen billion, six hundred eight million, nine hundred fifteen thousand, two hundred fifty-three".