2166178115690 has 16 divisors (see below), whose sum is σ = 4104337482720. Its totient is φ = 820867496400.

The previous prime is 2166178115663. The next prime is 2166178115693. The reversal of 2166178115690 is 965118716612.

It is a super-2 number, since 2×2166178115690² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2166178115693) 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, 5700468536 + ... + 5700468915.

It is an arithmetic number, because the mean of its divisors is an integer number (256521092670).

Almost surely, 2^{2166178115690} is an apocalyptic number.

2166178115690 is a deficient number, since it is larger than the sum of its proper divisors (1938159367030).

2166178115690 is a wasteful number, since it uses less digits than its factorization.

2166178115690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11400937477.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 2166178115690 in words is "two trillion, one hundred sixty-six billion, one hundred seventy-eight million, one hundred fifteen thousand, six hundred ninety".