18250521550 has 12 divisors (see below), whose sum is σ = 33945970176. Its totient is φ = 7300208600.

The previous prime is 18250521517. The next prime is 18250521557. The reversal of 18250521550 is 5512505281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18250521557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182505166 + ... + 182505265.

It is an arithmetic number, because the mean of its divisors is an integer number (2828830848).

Almost surely, 2^18250521550 is an apocalyptic number.

18250521550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18250521550 is a deficient number, since it is larger than the sum of its proper divisors (15695448626).

18250521550 is a wasteful number, since it uses less digits than its factorization.

18250521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365010443 (or 365010438 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 34.

The spelling of 18250521550 in words is "eighteen billion, two hundred fifty million, five hundred twenty-one thousand, five hundred fifty".