18671156089 has 4 divisors (see below), whose sum is σ = 18673182324. Its totient is φ = 18669129856.

The previous prime is 18671156051. The next prime is 18671156123. The reversal of 18671156089 is 98065117681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98065117681 = 53617 ⋅1828993.

It can be written as a sum of positive squares in 2 ways, for example, as 3029401600 + 15641754489 = 55040^2 + 125067^2 .

It is a cyclic number.

It is not a de Polignac number, because 18671156089 - 2¹⁹ = 18670631801 is a prime.

It is a super-2 number, since 2×18671156089² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18671156029) 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 3 ways as a sum of consecutive naturals, for example, 999232 + ... + 1017745.

It is an arithmetic number, because the mean of its divisors is an integer number (4668295581).

Almost surely, 2^18671156089 is an apocalyptic number.

It is an amenable number.

18671156089 is a deficient number, since it is larger than the sum of its proper divisors (2026235).

18671156089 is an equidigital number, since it uses as much as digits as its factorization.

18671156089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026234.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 18671156089 in words is "eighteen billion, six hundred seventy-one million, one hundred fifty-six thousand, eighty-nine".