166697907 has 4 divisors (see below), whose sum is σ = 222263880. Its totient is φ = 111131936.

The previous prime is 166697891. The next prime is 166697917. The reversal of 166697907 is 709796661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166697907 - 2⁴ = 166697891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166697907.

It is not an unprimeable number, because it can be changed into a prime (166697917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27782982 + ... + 27782987.

It is an arithmetic number, because the mean of its divisors is an integer number (55565970).

Almost surely, 2^166697907 is an apocalyptic number.

166697907 is a deficient number, since it is larger than the sum of its proper divisors (55565973).

166697907 is an equidigital number, since it uses as much as digits as its factorization.

166697907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55565972.

The product of its (nonzero) digits is 857304, while the sum is 51.

The square root of 166697907 is about 12911.1543635726. The cubic root of 166697907 is about 550.3555904369.

The spelling of 166697907 in words is "one hundred sixty-six million, six hundred ninety-seven thousand, nine hundred seven".