18418713639 has 16 divisors (see below), whose sum is σ = 25898129280. Its totient is φ = 11611585440.

The previous prime is 18418713629. The next prime is 18418713641. The reversal of 18418713639 is 93631781481.

It is a happy number.

It is not a de Polignac number, because 18418713639 - 2⁹ = 18418713127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18418713591 and 18418713600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418713629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264192 + ... + 326549.

It is an arithmetic number, because the mean of its divisors is an integer number (1618633080).

Almost surely, 2^18418713639 is an apocalyptic number.

18418713639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18418713639 is a deficient number, since it is larger than the sum of its proper divisors (7479415641).

18418713639 is a wasteful number, since it uses less digits than its factorization.

18418713639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591310.

The product of its digits is 870912, while the sum is 51.

The spelling of 18418713639 in words is "eighteen billion, four hundred eighteen million, seven hundred thirteen thousand, six hundred thirty-nine".