818669057 has 2 divisors, whose sum is σ = 818669058. Its totient is φ = 818669056.

The previous prime is 818669041. The next prime is 818669087. The reversal of 818669057 is 750966818.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650811121 + 167857936 = 25511^2 + 12956^2 .

It is a cyclic number.

It is not a de Polignac number, because 818669057 - 2⁴ = 818669041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 818668996 and 818669014.

It is not a weakly prime, because it can be changed into another prime (818669087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409334528 + 409334529.

It is an arithmetic number, because the mean of its divisors is an integer number (409334529).

Almost surely, 2^818669057 is an apocalyptic number.

It is an amenable number.

818669057 is a deficient number, since it is larger than the sum of its proper divisors (1).

818669057 is an equidigital number, since it uses as much as digits as its factorization.

818669057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 818669057 is about 28612.3934161405. The cubic root of 818669057 is about 935.4834858281.

The spelling of 818669057 in words is "eight hundred eighteen million, six hundred sixty-nine thousand, fifty-seven".