18329193550 has 24 divisors (see below), whose sum is σ = 34296461136. Its totient is φ = 7287771840.

The previous prime is 18329193521. The next prime is 18329193559. The reversal of 18329193550 is 5539192381.

It is a self number, because there is not a number n which added to its sum of digits gives 18329193550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18329193559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1089207 + ... + 1105906.

It is an arithmetic number, because the mean of its divisors is an integer number (1429019214).

Almost surely, 2^18329193550 is an apocalyptic number.

18329193550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18329193550 is a deficient number, since it is larger than the sum of its proper divisors (15967267586).

18329193550 is a wasteful number, since it uses less digits than its factorization.

18329193550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195292 (or 2195287 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 18329193550 in words is "eighteen billion, three hundred twenty-nine million, one hundred ninety-three thousand, five hundred fifty".