18668371850 has 12 divisors (see below), whose sum is σ = 34723171734. Its totient is φ = 7467348720.

The previous prime is 18668371837. The next prime is 18668371859. The reversal of 18668371850 is 5817386681.

It can be written as a sum of positive squares in 3 ways, for example, as 16746689281 + 1921682569 = 129409^2 + 43837^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18668371792 and 18668371801.

It is not an unprimeable number, because it can be changed into a prime (18668371859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186683669 + ... + 186683768.

Almost surely, 2^18668371850 is an apocalyptic number.

18668371850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18668371850 is a deficient number, since it is larger than the sum of its proper divisors (16054799884).

18668371850 is a wasteful number, since it uses less digits than its factorization.

18668371850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373367449 (or 373367444 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 18668371850 in words is "eighteen billion, six hundred sixty-eight million, three hundred seventy-one thousand, eight hundred fifty".