816808618 has 4 divisors (see below), whose sum is σ = 1225212930. Its totient is φ = 408404308.

The previous prime is 816808589. The next prime is 816808621.

816808618 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 776904129 + 39904489 = 27873^2 + 6317^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204202153 + ... + 204202156.

Almost surely, 2^816808618 is an apocalyptic number.

816808618 is a deficient number, since it is larger than the sum of its proper divisors (408404312).

816808618 is a wasteful number, since it uses less digits than its factorization.

816808618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408404311.

The product of its (nonzero) digits is 147456, while the sum is 46.

The square root of 816808618 is about 28579.8638555190. The cubic root of 816808618 is about 934.7743144468.

The spelling of 816808618 in words is "eight hundred sixteen million, eight hundred eight thousand, six hundred eighteen".