18853647631 has 48 divisors (see below), whose sum is σ = 23855795040. Its totient is φ = 14768490240.

The previous prime is 18853647613. The next prime is 18853647641. The reversal of 18853647631 is 13674635881.

It is a happy number.

It is not a de Polignac number, because 18853647631 - 2¹³ = 18853639439 is a prime.

It is a super-2 number, since 2×18853647631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18853647601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44782801 + ... + 44783221.

It is an arithmetic number, because the mean of its divisors is an integer number (496995730).

Almost surely, 2^18853647631 is an apocalyptic number.

18853647631 is a deficient number, since it is larger than the sum of its proper divisors (5002147409).

18853647631 is a wasteful number, since it uses less digits than its factorization.

18853647631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 977 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 18853647631 in words is "eighteen billion, eight hundred fifty-three million, six hundred forty-seven thousand, six hundred thirty-one".