166681411 has 32 divisors (see below), whose sum is σ = 192745728. Its totient is φ = 143078400.

The previous prime is 166681409. The next prime is 166681457. The reversal of 166681411 is 114186661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166681411 - 2¹ = 166681409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166681111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1650261 + ... + 1650361.

It is an arithmetic number, because the mean of its divisors is an integer number (6023304).

Almost surely, 2^166681411 is an apocalyptic number.

166681411 is a deficient number, since it is larger than the sum of its proper divisors (26064317).

166681411 is a wasteful number, since it uses less digits than its factorization.

166681411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 6912, while the sum is 34.

The square root of 166681411 is about 12910.5155203036. The cubic root of 166681411 is about 550.3374359092.

The spelling of 166681411 in words is "one hundred sixty-six million, six hundred eighty-one thousand, four hundred eleven".