2018681164809 has 15 divisors (see below), whose sum is σ = 3015579854397. Its totient is φ = 1345778918388.

The previous prime is 2018681164771. The next prime is 2018681164861. The reversal of 2018681164809 is 9084611868102.

It is a happy number.

The square root of 2018681164809 is 1420803.

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

2018681164809 is a `hidden beast` number, since 2 + 0 + 1 + 86 + 81 + 1 + 6 + 480 + 9 = 666.

It is not a de Polignac number, because 2018681164809 - 2⁷ = 2018681164681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2018681162809) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 12708294 + ... + 12866160.

Almost surely, 2^{2018681164809} is an apocalyptic number.

2018681164809 is the 1420803-rd square number.

2018681164809 is the 710402-nd centered octagonal number.

It is an amenable number.

2018681164809 is a deficient number, since it is larger than the sum of its proper divisors (996898689588).

2018681164809 is an frugal number, since it uses more digits than its factorization.

2018681164809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315746 (or 157870 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 2018681164809 in words is "two trillion, eighteen billion, six hundred eighty-one million, one hundred sixty-four thousand, eight hundred nine".