18115031802 has 64 divisors (see below), whose sum is σ = 43933777920. Its totient is φ = 4861007616.

The previous prime is 18115031773. The next prime is 18115031827. The reversal of 18115031802 is 20813051181.

It is a self number, because there is not a number n which added to its sum of digits gives 18115031802.

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, 315523 + ... + 368489.

It is an arithmetic number, because the mean of its divisors is an integer number (686465280).

Almost surely, 2^18115031802 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18115031802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21966888960).

18115031802 is an abundant number, since it is smaller than the sum of its proper divisors (25818746118).

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

18115031802 is a wasteful number, since it uses less digits than its factorization.

18115031802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53475.

The product of its (nonzero) digits is 1920, while the sum is 30.

Adding to 18115031802 its reverse (20813051181), we get a palindrome (38928082983).

The spelling of 18115031802 in words is "eighteen billion, one hundred fifteen million, thirty-one thousand, eight hundred two".