2166613665366 has 8 divisors (see below), whose sum is σ = 4333227330744. Its totient is φ = 722204555120.

The previous prime is 2166613665361. The next prime is 2166613665379. The reversal of 2166613665366 is 6635663166612.

It is a happy number.

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

2166613665366 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166613665361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180551138775 + ... + 180551138786.

It is an arithmetic number, because the mean of its divisors is an integer number (541653416343).

Almost surely, 2^{2166613665366} is an apocalyptic number.

2166613665366 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166613665366 is a wasteful number, since it uses less digits than its factorization.

2166613665366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361102277566.

The product of its digits is 25194240, while the sum is 57.

The spelling of 2166613665366 in words is "two trillion, one hundred sixty-six billion, six hundred thirteen million, six hundred sixty-five thousand, three hundred sixty-six".