2162661809 has 32 divisors (see below), whose sum is σ = 2772064512. Its totient is φ = 1638144000.

The previous prime is 2162661799. The next prime is 2162661811. The reversal of 2162661809 is 9081662612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2162661809 - 2¹² = 2162657713 is a prime.

It is a super-2 number, since 2×2162661809² = 9354212200214304962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2162661859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999689 + ... + 1001849.

It is an arithmetic number, because the mean of its divisors is an integer number (86627016).

Almost surely, 2^2162661809 is an apocalyptic number.

It is an amenable number.

2162661809 is a deficient number, since it is larger than the sum of its proper divisors (609402703).

2162661809 is a wasteful number, since it uses less digits than its factorization.

2162661809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 2162661809 is about 46504.4278429485. The cubic root of 2162661809 is about 1293.1915862045.

The spelling of 2162661809 in words is "two billion, one hundred sixty-two million, six hundred sixty-one thousand, eight hundred nine".