18181969850 has 24 divisors (see below), whose sum is σ = 36892870848. Its totient is φ = 6611625200.

The previous prime is 18181969849. The next prime is 18181969873. The reversal of 18181969850 is 5896918181.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16528514 + ... + 16529613.

It is an arithmetic number, because the mean of its divisors is an integer number (1537202952).

Almost surely, 2^18181969850 is an apocalyptic number.

18181969850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18181969850 is an abundant number, since it is smaller than the sum of its proper divisors (18710900998).

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

18181969850 is a wasteful number, since it uses less digits than its factorization.

18181969850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33058150 (or 33058145 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 56.

The spelling of 18181969850 in words is "eighteen billion, one hundred eighty-one million, nine hundred sixty-nine thousand, eight hundred fifty".