18616878656 has 28 divisors (see below), whose sum is σ = 37003212252. Its totient is φ = 9293234688.

The previous prime is 18616878617. The next prime is 18616878667. The reversal of 18616878656 is 65687861681.

It can be written as a sum of positive squares in 2 ways, for example, as 7227720256 + 11389158400 = 85016^2 + 106720^2 .

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 3 ways as a sum of consecutive naturals, for example, 198035 + ... + 276498.

Almost surely, 2^18616878656 is an apocalyptic number.

18616878656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18616878656 is a deficient number, since it is larger than the sum of its proper divisors (18386333596).

18616878656 is an equidigital number, since it uses as much as digits as its factorization.

18616878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475158 (or 475148 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The spelling of 18616878656 in words is "eighteen billion, six hundred sixteen million, eight hundred seventy-eight thousand, six hundred fifty-six".