18278638850 has 48 divisors (see below), whose sum is σ = 36018004968. Its totient is φ = 6877578240.

The previous prime is 18278638843. The next prime is 18278638883. The reversal of 18278638850 is 5883687281.

It can be written as a sum of positive squares in 12 ways, for example, as 11545287601 + 6733351249 = 107449^2 + 82057^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1896644 + ... + 1906256.

Almost surely, 2^18278638850 is an apocalyptic number.

18278638850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18278638850 is a deficient number, since it is larger than the sum of its proper divisors (17739366118).

18278638850 is a wasteful number, since it uses less digits than its factorization.

18278638850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879 (or 11874 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 18278638850 in words is "eighteen billion, two hundred seventy-eight million, six hundred thirty-eight thousand, eight hundred fifty".