18591091050 has 96 divisors (see below), whose sum is σ = 52734731904. Its totient is φ = 4245984000.

The previous prime is 18591091049. The next prime is 18591091069. The reversal of 18591091050 is 5019019581.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1443640 + ... + 1456460.

It is an arithmetic number, because the mean of its divisors is an integer number (549320124).

Almost surely, 2^18591091050 is an apocalyptic number.

18591091050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18591091050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26367365952).

18591091050 is an abundant number, since it is smaller than the sum of its proper divisors (34143640854).

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

18591091050 is a wasteful number, since it uses less digits than its factorization.

18591091050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14224 (or 14219 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 39.

The spelling of 18591091050 in words is "eighteen billion, five hundred ninety-one million, ninety-one thousand, fifty".