166666668049 has 8 divisors (see below), whose sum is σ = 190495630080. Its totient is φ = 142842565536.

The previous prime is 166666668041. The next prime is 166666668071. The reversal of 166666668049 is 940866666661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166666668049 - 2³ = 166666668041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166666668041) 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, 1141084 + ... + 1278829.

It is an arithmetic number, because the mean of its divisors is an integer number (23811953760).

Almost surely, 2^166666668049 is an apocalyptic number.

It is an amenable number.

166666668049 is a deficient number, since it is larger than the sum of its proper divisors (23828962031).

166666668049 is an equidigital number, since it uses as much as digits as its factorization.

166666668049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429759.

The product of its (nonzero) digits is 80621568, while the sum is 64.

The spelling of 166666668049 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-eight thousand, forty-nine".