18853990641 has 12 divisors (see below), whose sum is σ = 28835515332. Its totient is φ = 11829954816.

The previous prime is 18853990637. The next prime is 18853990667. The reversal of 18853990641 is 14609935881.

18853990641 is a `hidden beast` number, since 18 + 8 + 539 + 90 + 6 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7548134400 + 11305856241 = 86880^2 + 106329^2 .

It is not a de Polignac number, because 18853990641 - 2² = 18853990637 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18853910641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61614196 + ... + 61614501.

It is an arithmetic number, because the mean of its divisors is an integer number (2402959611).

Almost surely, 2^18853990641 is an apocalyptic number.

It is an amenable number.

18853990641 is a deficient number, since it is larger than the sum of its proper divisors (9981524691).

18853990641 is a wasteful number, since it uses less digits than its factorization.

18853990641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123228720 (or 123228717 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 18853990641 in words is "eighteen billion, eight hundred fifty-three million, nine hundred ninety thousand, six hundred forty-one".