8640181158 has 64 divisors (see below), whose sum is σ = 20397629952. Its totient is φ = 2388821760.

The previous prime is 8640181139. The next prime is 8640181171. The reversal of 8640181158 is 8511810468.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135913 + ... + 189083.

It is an arithmetic number, because the mean of its divisors is an integer number (318712968).

Almost surely, 2^8640181158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8640181158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10198814976).

8640181158 is an abundant number, since it is smaller than the sum of its proper divisors (11757448794).

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

8640181158 is a wasteful number, since it uses less digits than its factorization.

8640181158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53309.

The product of its (nonzero) digits is 61440, while the sum is 42.

The square root of 8640181158 is about 92952.5747787548. The cubic root of 8640181158 is about 2051.9854773851.

The spelling of 8640181158 in words is "eight billion, six hundred forty million, one hundred eighty-one thousand, one hundred fifty-eight".