18746998906 has 16 divisors (see below), whose sum is σ = 28184322600. Its totient is φ = 9352242688.

The previous prime is 18746998903. The next prime is 18746998909. The reversal of 18746998906 is 60989964781.

It is an interprime number because it is at equal distance from previous prime (18746998903) and next prime (18746998909).

It can be written as a sum of positive squares in 4 ways, for example, as 18721080625 + 25918281 = 136825^2 + 5091^2 .

It is not an unprimeable number, because it can be changed into a prime (18746998903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512616 + ... + 3517948.

Almost surely, 2^18746998906 is an apocalyptic number.

18746998906 is a deficient number, since it is larger than the sum of its proper divisors (9437323694).

18746998906 is a wasteful number, since it uses less digits than its factorization.

18746998906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8993.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 18746998906 in words is "eighteen billion, seven hundred forty-six million, nine hundred ninety-eight thousand, nine hundred six".