2168888391966 has 16 divisors (see below), whose sum is σ = 4386515850000. Its totient is φ = 714839619648.

The previous prime is 2168888391961. The next prime is 2168888392031. The reversal of 2168888391966 is 6691938888612.

It is a super-2 number, since 2×2168888391966² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168888391961) 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, 2030793841 + ... + 2030794908.

It is an arithmetic number, because the mean of its divisors is an integer number (274157240625).

Almost surely, 2^{2168888391966} is an apocalyptic number.

2168888391966 is an abundant number, since it is smaller than the sum of its proper divisors (2217627458034).

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

2168888391966 is a wasteful number, since it uses less digits than its factorization.

2168888391966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061588843.

The product of its digits is 429981696, while the sum is 75.

The spelling of 2168888391966 in words is "two trillion, one hundred sixty-eight billion, eight hundred eighty-eight million, three hundred ninety-one thousand, nine hundred sixty-six".