18158228616 has 128 divisors (see below), whose sum is σ = 49909478400. Its totient is φ = 5459700480.

The previous prime is 18158228609. The next prime is 18158228651. The reversal of 18158228616 is 61682285181.

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, 26821270 + ... + 26821946.

It is an arithmetic number, because the mean of its divisors is an integer number (389917800).

Almost surely, 2^18158228616 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 18158228616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24954739200).

18158228616 is an abundant number, since it is smaller than the sum of its proper divisors (31751249784).

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

18158228616 is a wasteful number, since it uses less digits than its factorization.

18158228616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1335 counting only the distinct ones).

The product of its digits is 368640, while the sum is 48.

The spelling of 18158228616 in words is "eighteen billion, one hundred fifty-eight million, two hundred twenty-eight thousand, six hundred sixteen".