18512229789 has 12 divisors (see below), whose sum is σ = 26741066716. Its totient is φ = 12340942272.

The previous prime is 18512229787. The next prime is 18512229821. The reversal of 18512229789 is 98792221581.

18512229789 is a `hidden beast` number, since 18 + 512 + 22 + 97 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13016528100 + 5495701689 = 114090^2 + 74133^2 .

It is not a de Polignac number, because 18512229789 - 2¹ = 18512229787 is a prime.

It is a super-3 number, since 3×18512229789³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512229787) 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 11 ways as a sum of consecutive naturals, for example, 381699 + ... + 427455.

Almost surely, 2^18512229789 is an apocalyptic number.

It is an amenable number.

18512229789 is a deficient number, since it is larger than the sum of its proper divisors (8228836927).

18512229789 is a wasteful number, since it uses less digits than its factorization.

18512229789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90716 (or 90713 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 18512229789 in words is "eighteen billion, five hundred twelve million, two hundred twenty-nine thousand, seven hundred eighty-nine".