2166884661 has 8 divisors (see below), whose sum is σ = 2891985984. Its totient is φ = 1443186560.

The previous prime is 2166884647. The next prime is 2166884677. The reversal of 2166884661 is 1664886612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166884661 - 2⁶ = 2166884597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2166884661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166884561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347196 + ... + 353381.

It is an arithmetic number, because the mean of its divisors is an integer number (361498248).

Almost surely, 2^2166884661 is an apocalyptic number.

It is an amenable number.

2166884661 is a deficient number, since it is larger than the sum of its proper divisors (725101323).

2166884661 is a wasteful number, since it uses less digits than its factorization.

2166884661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701611.

The product of its digits is 663552, while the sum is 48.

The square root of 2166884661 is about 46549.8083884349. The cubic root of 2166884661 is about 1294.0327419378.

The spelling of 2166884661 in words is "two billion, one hundred sixty-six million, eight hundred eighty-four thousand, six hundred sixty-one".