18503838550 has 12 divisors (see below), whose sum is σ = 34417139796. Its totient is φ = 7401535400.

The previous prime is 18503838499. The next prime is 18503838569. The reversal of 18503838550 is 5583830581.

It is a super-2 number, since 2×18503838550² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18503838550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185038336 + ... + 185038435.

It is an arithmetic number, because the mean of its divisors is an integer number (2868094983).

Almost surely, 2^18503838550 is an apocalyptic number.

18503838550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18503838550 is a deficient number, since it is larger than the sum of its proper divisors (15913301246).

18503838550 is a wasteful number, since it uses less digits than its factorization.

18503838550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370076783 (or 370076778 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 46.

The spelling of 18503838550 in words is "eighteen billion, five hundred three million, eight hundred thirty-eight thousand, five hundred fifty".