18720146889 has 12 divisors (see below), whose sum is σ = 27307938372. Its totient is φ = 12356532000.

The previous prime is 18720146873. The next prime is 18720146923. The reversal of 18720146889 is 98864102781.

18720146889 is a `hidden beast` number, since 1 + 87 + 20 + 1 + 468 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16405767225 + 2314379664 = 128085^2 + 48108^2 .

It is not a de Polignac number, because 18720146889 - 2⁴ = 18720146873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18720146849) 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, 10296202 + ... + 10298019.

It is an arithmetic number, because the mean of its divisors is an integer number (2275661531).

Almost surely, 2^18720146889 is an apocalyptic number.

It is an amenable number.

18720146889 is a deficient number, since it is larger than the sum of its proper divisors (8587791483).

18720146889 is a wasteful number, since it uses less digits than its factorization.

18720146889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20594328 (or 20594325 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 18720146889 in words is "eighteen billion, seven hundred twenty million, one hundred forty-six thousand, eight hundred eighty-nine".