18138539495 has 4 divisors (see below), whose sum is σ = 21766247400. Its totient is φ = 14510831592.

The previous prime is 18138539483. The next prime is 18138539509. The reversal of 18138539495 is 59493583181.

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 18138539495 - 2⁴ = 18138539479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18138539495.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813853945 + ... + 1813853954.

It is an arithmetic number, because the mean of its divisors is an integer number (5441561850).

Almost surely, 2^18138539495 is an apocalyptic number.

18138539495 is a deficient number, since it is larger than the sum of its proper divisors (3627707905).

18138539495 is an equidigital number, since it uses as much as digits as its factorization.

18138539495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3627707904.

The product of its digits is 4665600, while the sum is 56.

The spelling of 18138539495 in words is "eighteen billion, one hundred thirty-eight million, five hundred thirty-nine thousand, four hundred ninety-five".