18848189631 has 4 divisors (see below), whose sum is σ = 25130919512. Its totient is φ = 12565459752.

The previous prime is 18848189593. The next prime is 18848189651. The reversal of 18848189631 is 13698184881.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18848189631 - 2⁶ = 18848189567 is a prime.

It is a super-2 number, since 2×18848189631² (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 (18848189651) 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, 3141364936 + ... + 3141364941.

It is an arithmetic number, because the mean of its divisors is an integer number (6282729878).

Almost surely, 2^18848189631 is an apocalyptic number.

18848189631 is a deficient number, since it is larger than the sum of its proper divisors (6282729881).

18848189631 is an equidigital number, since it uses as much as digits as its factorization.

18848189631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6282729880.

The product of its digits is 2654208, while the sum is 57.

The spelling of 18848189631 in words is "eighteen billion, eight hundred forty-eight million, one hundred eighty-nine thousand, six hundred thirty-one".