18666163425 has 48 divisors (see below), whose sum is σ = 37983263360. Its totient is φ = 7876707840.

The previous prime is 18666163423. The next prime is 18666163427. The reversal of 18666163425 is 52436166681.

It is an interprime number because it is at equal distance from previous prime (18666163423) and next prime (18666163427).

It is not a de Polignac number, because 18666163425 - 2¹ = 18666163423 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18666163423) 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, 1360660 + ... + 1374309.

Almost surely, 2^18666163425 is an apocalyptic number.

18666163425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18666163425 is an abundant number, since it is smaller than the sum of its proper divisors (19317099935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18666163425 is a wasteful number, since it uses less digits than its factorization.

18666163425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735002 (or 2734997 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The spelling of 18666163425 in words is "eighteen billion, six hundred sixty-six million, one hundred sixty-three thousand, four hundred twenty-five".