166686667 has 16 divisors (see below), whose sum is σ = 194599872. Its totient is φ = 139829760.

The previous prime is 166686661. The next prime is 166686691. The reversal of 166686667 is 766686661.

It is not a de Polignac number, because 166686667 - 2⁷ = 166686539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166686661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68817 + ... + 71197.

It is an arithmetic number, because the mean of its divisors is an integer number (12162492).

Almost surely, 2^166686667 is an apocalyptic number.

166686667 is a deficient number, since it is larger than the sum of its proper divisors (27913205).

166686667 is a wasteful number, since it uses less digits than its factorization.

166686667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598.

The product of its digits is 2612736, while the sum is 52.

The square root of 166686667 is about 12910.7190737000. The cubic root of 166686667 is about 550.3432204838.

The spelling of 166686667 in words is "one hundred sixty-six million, six hundred eighty-six thousand, six hundred sixty-seven".