18275645388 has 384 divisors, whose sum is σ = 62600380416. Its totient is φ = 3989606400.

The previous prime is 18275645369. The next prime is 18275645429. The reversal of 18275645388 is 88354657281.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6328881 + ... + 6331767.

It is an arithmetic number, because the mean of its divisors is an integer number (163021824).

Almost surely, 2^18275645388 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 18275645388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31300190208).

18275645388 is an abundant number, since it is smaller than the sum of its proper divisors (44324735028).

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

18275645388 is a wasteful number, since it uses less digits than its factorization.

18275645388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973 (or 2971 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 57.

The spelling of 18275645388 in words is "eighteen billion, two hundred seventy-five million, six hundred forty-five thousand, three hundred eighty-eight".