18311656242 has 48 divisors (see below), whose sum is σ = 41237282016. Its totient is φ = 5413636800.

The previous prime is 18311656219. The next prime is 18311656249. The reversal of 18311656242 is 24265611381.

It is a self number, because there is not a number n which added to its sum of digits gives 18311656242.

It is not an unprimeable number, because it can be changed into a prime (18311656249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277828 + ... + 337359.

It is an arithmetic number, because the mean of its divisors is an integer number (859110042).

Almost surely, 2^18311656242 is an apocalyptic number.

18311656242 is an abundant number, since it is smaller than the sum of its proper divisors (22925625774).

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

18311656242 is a wasteful number, since it uses less digits than its factorization.

18311656242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615255 (or 615244 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The spelling of 18311656242 in words is "eighteen billion, three hundred eleven million, six hundred fifty-six thousand, two hundred forty-two".