18103694401 has 4 divisors (see below), whose sum is σ = 19496286292. Its totient is φ = 16711102512.

The previous prime is 18103694377. The next prime is 18103694449. The reversal of 18103694401 is 10449630181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3876930225 + 14226764176 = 62265^2 + 119276^2 .

It is not a de Polignac number, because 18103694401 - 2¹⁵ = 18103661633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18103694501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696295926 + ... + 696295951.

It is an arithmetic number, because the mean of its divisors is an integer number (4874071573).

Almost surely, 2^18103694401 is an apocalyptic number.

It is an amenable number.

18103694401 is a deficient number, since it is larger than the sum of its proper divisors (1392591891).

18103694401 is a wasteful number, since it uses less digits than its factorization.

18103694401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392591890.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 18103694401 in words is "eighteen billion, one hundred three million, six hundred ninety-four thousand, four hundred one".