166881366 has 48 divisors (see below), whose sum is σ = 371891520. Its totient is φ = 54054000.

The previous prime is 166881361. The next prime is 166881371. The reversal of 166881366 is 663188661.

166881366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166881361) and next prime (166881371).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166881361) 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, 193845 + ... + 194703.

It is an arithmetic number, because the mean of its divisors is an integer number (7747740).

Almost surely, 2^166881366 is an apocalyptic number.

166881366 is an abundant number, since it is smaller than the sum of its proper divisors (205010154).

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

166881366 is a wasteful number, since it uses less digits than its factorization.

166881366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1158 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 166881366 is about 12918.2570805817. The cubic root of 166881366 is about 550.5574139447.

The spelling of 166881366 in words is "one hundred sixty-six million, eight hundred eighty-one thousand, three hundred sixty-six".