18077311518 has 32 divisors (see below), whose sum is σ = 43116074496. Its totient is φ = 4940383008.

The previous prime is 18077311507. The next prime is 18077311547. The reversal of 18077311518 is 81511377081.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18077311518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9355821 + ... + 9357752.

It is an arithmetic number, because the mean of its divisors is an integer number (1347377328).

Almost surely, 2^18077311518 is an apocalyptic number.

18077311518 is an abundant number, since it is smaller than the sum of its proper divisors (25038762978).

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

18077311518 is a wasteful number, since it uses less digits than its factorization.

18077311518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18713608.

The product of its (nonzero) digits is 47040, while the sum is 42.

Adding to 18077311518 its reverse (81511377081), we get a palindrome (99588688599).

It can be divided in two parts, 180773 and 11518, that added together give a palindrome (192291).

The spelling of 18077311518 in words is "eighteen billion, seventy-seven million, three hundred eleven thousand, five hundred eighteen".