18025446861 has 20 divisors (see below), whose sum is σ = 27132466944. Its totient is φ = 11925225000.

The previous prime is 18025446841. The next prime is 18025446883. The reversal of 18025446861 is 16864452081.

It is a happy number.

18025446861 is a `hidden beast` number, since 1 + 80 + 2 + 54 + 468 + 61 = 666.

It is not a de Polignac number, because 18025446861 - 2¹⁴ = 18025430477 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18025446821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 838765 + ... + 859986.

Almost surely, 2^18025446861 is an apocalyptic number.

It is an amenable number.

18025446861 is a deficient number, since it is larger than the sum of its proper divisors (9107020083).

18025446861 is a wasteful number, since it uses less digits than its factorization.

18025446861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698894 (or 1698885 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 18025446861 in words is "eighteen billion, twenty-five million, four hundred forty-six thousand, eight hundred sixty-one".