3581316018 has 84 divisors (see below), whose sum is σ = 9369447390. Its totient is φ = 1023212736.

The previous prime is 3581316007. The next prime is 3581316019. The reversal of 3581316018 is 8106131853.

3581316018 is a `hidden beast` number, since 3 + 581 + 3 + 1 + 60 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2109289329 + 1472026689 = 45927^2 + 38367^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581316019) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 46378 + ... + 96506.

Almost surely, 2^3581316018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3581316018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4684723695).

3581316018 is an abundant number, since it is smaller than the sum of its proper divisors (5788131372).

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

3581316018 is an equidigital number, since it uses as much as digits as its factorization.

3581316018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50163 (or 50141 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 3581316018 is about 59844.0976036902. The cubic root of 3581316018 is about 1529.9628364676.

The spelling of 3581316018 in words is "three billion, five hundred eighty-one million, three hundred sixteen thousand, eighteen".