18231026639 has 8 divisors (see below), whose sum is σ = 21553923360. Its totient is φ = 15087746016.

The previous prime is 18231026621. The next prime is 18231026683. The reversal of 18231026639 is 93662013281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18231026639 - 2¹⁶ = 18230961103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18231026596 and 18231026605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231026939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44903804 + ... + 44904209.

It is an arithmetic number, because the mean of its divisors is an integer number (2694240420).

Almost surely, 2^18231026639 is an apocalyptic number.

18231026639 is a deficient number, since it is larger than the sum of its proper divisors (3322896721).

18231026639 is an equidigital number, since it uses as much as digits as its factorization.

18231026639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89808049.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 18231026639 in words is "eighteen billion, two hundred thirty-one million, twenty-six thousand, six hundred thirty-nine".