816868618 has 8 divisors (see below), whose sum is σ = 1225670148. Its totient is φ = 408311904.

The previous prime is 816868583. The next prime is 816868651.

816868618 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 767123809 + 49744809 = 27697^2 + 7053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52621 + ... + 66352.

Almost surely, 2^816868618 is an apocalyptic number.

816868618 is a deficient number, since it is larger than the sum of its proper divisors (408801530).

816868618 is a wasteful number, since it uses less digits than its factorization.

816868618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122408.

The product of its digits is 884736, while the sum is 52.

The square root of 816868618 is about 28580.9135263378. The cubic root of 816868618 is about 934.7972023401.

The spelling of 816868618 in words is "eight hundred sixteen million, eight hundred sixty-eight thousand, six hundred eighteen".