18261043850 has 48 divisors (see below), whose sum is σ = 41101172928. Its totient is φ = 5892637440.

The previous prime is 18261043807. The next prime is 18261043859. The reversal of 18261043850 is 5834016281.

It is not an unprimeable number, because it can be changed into a prime (18261043859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1528592 + ... + 1540491.

It is an arithmetic number, because the mean of its divisors is an integer number (856274436).

Almost surely, 2^18261043850 is an apocalyptic number.

18261043850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18261043850 is an abundant number, since it is smaller than the sum of its proper divisors (22840129078).

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

18261043850 is a wasteful number, since it uses less digits than its factorization.

18261043850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069119 (or 3069114 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 18261043850 in words is "eighteen billion, two hundred sixty-one million, forty-three thousand, eight hundred fifty".