818505818 has 32 divisors (see below), whose sum is σ = 1360718352. Its totient is φ = 366912000.

The previous prime is 818505791. The next prime is 818505827.

818505818 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 699761209 + 118744609 = 26453^2 + 10897^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 136238 + ... + 142118.

Almost surely, 2^818505818 is an apocalyptic number.

818505818 is a deficient number, since it is larger than the sum of its proper divisors (542212534).

818505818 is a wasteful number, since it uses less digits than its factorization.

818505818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 102400, while the sum is 44.

The square root of 818505818 is about 28609.5406813881. The cubic root of 818505818 is about 935.4213046010.

It can be divided in two parts, 8185058 and 18, that multiplied together give a square (147331044 = 12138²).

The spelling of 818505818 in words is "eight hundred eighteen million, five hundred five thousand, eight hundred eighteen".