7666786166 has 16 divisors (see below), whose sum is σ = 12406522128. Its totient is φ = 3532312800.

The previous prime is 7666786163. The next prime is 7666786189. The reversal of 7666786166 is 6616876667.

It is a happy number.

It is a super-2 number, since 2×7666786166² (a number of 21 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 (7666786163) 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, 243365 + ... + 273056.

It is an arithmetic number, because the mean of its divisors is an integer number (775407633).

Almost surely, 2^7666786166 is an apocalyptic number.

7666786166 is a deficient number, since it is larger than the sum of its proper divisors (4739735962).

7666786166 is a wasteful number, since it uses less digits than its factorization.

7666786166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517007.

The product of its digits is 18289152, while the sum is 59.

The square root of 7666786166 is about 87560.1859637130. The cubic root of 7666786166 is about 1971.8374780516.

The spelling of 7666786166 in words is "seven billion, six hundred sixty-six million, seven hundred eighty-six thousand, one hundred sixty-six".