18464189689 has 15 divisors (see below), whose sum is σ = 20328584565. Its totient is φ = 16770679860.

The previous prime is 18464189671. The next prime is 18464189699. The reversal of 18464189689 is 98698146481.

The square root of 18464189689 is 135883.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18464189689 - 2¹³ = 18464181497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18464189689.

It is not an unprimeable number, because it can be changed into a prime (18464189609) 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 14 ways as a sum of consecutive naturals, for example, 16441282 + ... + 16442404.

It is an arithmetic number, because the mean of its divisors is an integer number (1355238971).

Almost surely, 2^18464189689 is an apocalyptic number.

18464189689 is the 135883-rd square number.

18464189689 is the 67942-nd centered octagonal number.

It is an amenable number.

18464189689 is a deficient number, since it is larger than the sum of its proper divisors (1864394876).

18464189689 is an frugal number, since it uses more digits than its factorization.

18464189689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290 (or 1134 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 64.

Multiplying 18464189689 by its sum of digits (64), we get a square (1181708140096 = 1087064²).

The spelling of 18464189689 in words is "eighteen billion, four hundred sixty-four million, one hundred eighty-nine thousand, six hundred eighty-nine".