18550015850 has 24 divisors (see below), whose sum is σ = 34637306508. Its totient is φ = 7391129600.

The previous prime is 18550015829. The next prime is 18550015889. The reversal of 18550015850 is 5851005581.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8347197769 + 10202818081 = 91363^2 + 101009^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 708941 + ... + 734640.

Almost surely, 2^18550015850 is an apocalyptic number.

18550015850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18550015850 is a deficient number, since it is larger than the sum of its proper divisors (16087290658).

18550015850 is a wasteful number, since it uses less digits than its factorization.

18550015850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443850 (or 1443845 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 38.

The spelling of 18550015850 in words is "eighteen billion, five hundred fifty million, fifteen thousand, eight hundred fifty".