16818123634 has 32 divisors (see below), whose sum is σ = 27982508400. Its totient is φ = 7530630912.

The previous prime is 16818123629. The next prime is 16818123653. The reversal of 16818123634 is 43632181861.

It can be written as a sum of positive squares in 8 ways, for example, as 6075423025 + 10742700609 = 77945^2 + 103647^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310692 + ... + 360784.

Almost surely, 2^16818123634 is an apocalyptic number.

16818123634 is a deficient number, since it is larger than the sum of its proper divisors (11164384766).

16818123634 is a wasteful number, since it uses less digits than its factorization.

16818123634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50494.

The product of its digits is 165888, while the sum is 43.

The spelling of 16818123634 in words is "sixteen billion, eight hundred eighteen million, one hundred twenty-three thousand, six hundred thirty-four".