18745618031 has 4 divisors (see below), whose sum is σ = 21423563472. Its totient is φ = 16067672592.

The previous prime is 18745618013. The next prime is 18745618043. The reversal of 18745618031 is 13081654781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13081654781 = 13 ⋅1006281137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18745618031 is a prime.

It is a super-2 number, since 2×18745618031² (a number of 21 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 (18745618231) 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, 1338972710 + ... + 1338972723.

It is an arithmetic number, because the mean of its divisors is an integer number (5355890868).

Almost surely, 2^18745618031 is an apocalyptic number.

18745618031 is a deficient number, since it is larger than the sum of its proper divisors (2677945441).

18745618031 is an equidigital number, since it uses as much as digits as its factorization.

18745618031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677945440.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 18745618031 in words is "eighteen billion, seven hundred forty-five million, six hundred eighteen thousand, thirty-one".