18708990338 has 12 divisors (see below), whose sum is σ = 29618250390. Its totient is φ = 8862152976.

The previous prime is 18708990283. The next prime is 18708990343. The reversal of 18708990338 is 83309980781.

It can be written as a sum of positive squares in only one way, i.e., 17856175129 + 852815209 = 133627^2 + 29203^2 .

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 5 ways as a sum of consecutive naturals, for example, 12955643 + ... + 12957086.

Almost surely, 2^18708990338 is an apocalyptic number.

18708990338 is a deficient number, since it is larger than the sum of its proper divisors (10909260052).

18708990338 is a wasteful number, since it uses less digits than its factorization.

18708990338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25912769 (or 25912750 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 18708990338 in words is "eighteen billion, seven hundred eight million, nine hundred ninety thousand, three hundred thirty-eight".