166666697 has 4 divisors (see below), whose sum is σ = 166698000. Its totient is φ = 166635396.

The previous prime is 166666693. The next prime is 166666711. The reversal of 166666697 is 796666661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 796666661 = 7 ⋅113809523.

It is a cyclic number.

It is not a de Polignac number, because 166666697 - 2² = 166666693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166666693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5447 + ... + 19052.

It is an arithmetic number, because the mean of its divisors is an integer number (41674500).

Almost surely, 2^166666697 is an apocalyptic number.

It is an amenable number.

166666697 is a deficient number, since it is larger than the sum of its proper divisors (31303).

166666697 is an equidigital number, since it uses as much as digits as its factorization.

166666697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31302.

The product of its digits is 2939328, while the sum is 53.

The square root of 166666697 is about 12909.9456621630. The cubic root of 166666697 is about 550.3212415353.

The spelling of 166666697 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred ninety-seven".