18158919850 has 24 divisors (see below), whose sum is σ = 34940269260. Its totient is φ = 7013099520.

The previous prime is 18158919841. The next prime is 18158919853. The reversal of 18158919850 is 5891985181.

It can be written as a sum of positive squares in 6 ways, for example, as 9381665881 + 8777253969 = 96859^2 + 93687^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18158919791 and 18158919800.

It is not an unprimeable number, because it can be changed into a prime (18158919853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6260247 + ... + 6263146.

Almost surely, 2^18158919850 is an apocalyptic number.

18158919850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18158919850 is a deficient number, since it is larger than the sum of its proper divisors (16781349410).

18158919850 is a wasteful number, since it uses less digits than its factorization.

18158919850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12523434 (or 12523429 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 55.

The spelling of 18158919850 in words is "eighteen billion, one hundred fifty-eight million, nine hundred nineteen thousand, eight hundred fifty".