18138702216431 has 4 divisors (see below), whose sum is σ = 18229851474000. Its totient is φ = 18047552958864.

The previous prime is 18138702216421. The next prime is 18138702216493. The reversal of 18138702216431 is 13461220783181.

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 18138702216431 - 2¹⁸ = 18138701954287 is a prime.

It is a super-2 number, since 2×18138702216431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138702216421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45574628486 + ... + 45574628883.

It is an arithmetic number, because the mean of its divisors is an integer number (4557462868500).

Almost surely, 2^{18138702216431} is an apocalyptic number.

18138702216431 is a deficient number, since it is larger than the sum of its proper divisors (91149257569).

18138702216431 is an equidigital number, since it uses as much as digits as its factorization.

18138702216431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91149257568.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 18138702216431 in words is "eighteen trillion, one hundred thirty-eight billion, seven hundred two million, two hundred sixteen thousand, four hundred thirty-one".