18139299503 has 4 divisors (see below), whose sum is σ = 19534630248. Its totient is φ = 16743968760.

The previous prime is 18139299473. The next prime is 18139299511. The reversal of 18139299503 is 30599293181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18139299503 - 2¹⁴ = 18139283119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139299553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697665353 + ... + 697665378.

It is an arithmetic number, because the mean of its divisors is an integer number (4883657562).

Almost surely, 2^18139299503 is an apocalyptic number.

18139299503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18139299503 is a deficient number, since it is larger than the sum of its proper divisors (1395330745).

18139299503 is a wasteful number, since it uses less digits than its factorization.

18139299503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395330744.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 18139299503 in words is "eighteen billion, one hundred thirty-nine million, two hundred ninety-nine thousand, five hundred three".