18689791122 has 90 divisors (see below), whose sum is σ = 43872913623. Its totient is φ = 5946303528.

The previous prime is 18689791111. The next prime is 18689791129. The reversal of 18689791122 is 22119798681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9344895561 + 9344895561 = 96669^2 + 96669^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96669.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18689791129) by changing a digit.

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 44 ways as a sum of consecutive naturals, for example, 40020733 + ... + 40021199.

Almost surely, 2^18689791122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18689791122

18689791122 is an abundant number, since it is smaller than the sum of its proper divisors (25183122501).

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

18689791122 is an frugal number, since it uses more digits than its factorization.

18689791122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 495 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The spelling of 18689791122 in words is "eighteen billion, six hundred eighty-nine million, seven hundred ninety-one thousand, one hundred twenty-two".