18025964856 has 80 divisors (see below), whose sum is σ = 50586881400. Its totient is φ = 5997053376.

The previous prime is 18025964851. The next prime is 18025964857. The reversal of 18025964856 is 65846952081.

18025964856 is a `hidden beast` number, since 1 + 8 + 0 + 2 + 596 + 48 + 5 + 6 = 666.

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 a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18025964851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 312310 + ... + 365498.

Almost surely, 2^18025964856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18025964856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25293440700).

18025964856 is an abundant number, since it is smaller than the sum of its proper divisors (32560916544).

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

18025964856 is a wasteful number, since it uses less digits than its factorization.

18025964856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53730 (or 53717 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 18025964856 in words is "eighteen billion, twenty-five million, nine hundred sixty-four thousand, eight hundred fifty-six".