18351851850 has 36 divisors (see below), whose sum is σ = 49305309846. Its totient is φ = 4893827040.

The previous prime is 18351851831. The next prime is 18351851873. The reversal of 18351851850 is 5815815381.

18351851850 is a `hidden beast` number, since 1 + 8 + 3 + 518 + 51 + 85 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 17808635601 + 543216249 = 133449^2 + 23307^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 18351851796 and 18351851805.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20390497 + ... + 20391396.

Almost surely, 2^18351851850 is an apocalyptic number.

18351851850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18351851850 is an abundant number, since it is smaller than the sum of its proper divisors (30953457996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18351851850 is a wasteful number, since it uses less digits than its factorization.

18351851850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40781911 (or 40781903 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 45.

The spelling of 18351851850 in words is "eighteen billion, three hundred fifty-one million, eight hundred fifty-one thousand, eight hundred fifty".