18135461888 has 52 divisors (see below), whose sum is σ = 36302577528. Its totient is φ = 9058713600.

The previous prime is 18135461887. The next prime is 18135461923. The reversal of 18135461888 is 88816453181.

It is a super-2 number, since 2×18135461888² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18135461887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6359663 + ... + 6362513.

Almost surely, 2^18135461888 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 18135461888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18151288764).

18135461888 is an abundant number, since it is smaller than the sum of its proper divisors (18167115640).

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

18135461888 is an equidigital number, since it uses as much as digits as its factorization.

18135461888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428 (or 4406 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 53.

The spelling of 18135461888 in words is "eighteen billion, one hundred thirty-five million, four hundred sixty-one thousand, eight hundred eighty-eight".