2166566665122 has 48 divisors (see below), whose sum is σ = 4853508820992. Its totient is φ = 697759634880.

The previous prime is 2166566665117. The next prime is 2166566665127. The reversal of 2166566665122 is 2215666656612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2166566665117) and next prime (2166566665127).

It is a super-2 number, since 2×2166566665122² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2166566665127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2802178 + ... + 3490749.

It is an arithmetic number, because the mean of its divisors is an integer number (101114767104).

Almost surely, 2^{2166566665122} is an apocalyptic number.

2166566665122 is an abundant number, since it is smaller than the sum of its proper divisors (2686942155870).

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

2166566665122 is a wasteful number, since it uses less digits than its factorization.

2166566665122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293583 (or 6293580 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 2166566665122 in words is "two trillion, one hundred sixty-six billion, five hundred sixty-six million, six hundred sixty-five thousand, one hundred twenty-two".