18103694399 has 24 divisors (see below), whose sum is σ = 22387388400. Its totient is φ = 14555116800.

The previous prime is 18103694377. The next prime is 18103694449. The reversal of 18103694399 is 99349630181.

It is a happy number.

It is not a de Polignac number, because 18103694399 - 2⁸ = 18103694143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18103694399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18103694099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2234 + ... + 190295.

It is an arithmetic number, because the mean of its divisors is an integer number (932807850).

Almost surely, 2^18103694399 is an apocalyptic number.

18103694399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18103694399 is a deficient number, since it is larger than the sum of its proper divisors (4283694001).

18103694399 is a wasteful number, since it uses less digits than its factorization.

18103694399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192663 (or 192656 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 53.

The spelling of 18103694399 in words is "eighteen billion, one hundred three million, six hundred ninety-four thousand, three hundred ninety-nine".