166668099 has 16 divisors (see below), whose sum is σ = 240059904. Its totient is φ = 102247200.

The previous prime is 166668083. The next prime is 166668101. The reversal of 166668099 is 990866661.

It is a Cunningham number, because it is equal to 12910²-1.

It is not a de Polignac number, because 166668099 - 2⁴ = 166668083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166668049) 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, 6454 + ... + 19364.

It is an arithmetic number, because the mean of its divisors is an integer number (15003744).

Almost surely, 2^166668099 is an apocalyptic number.

166668099 is a deficient number, since it is larger than the sum of its proper divisors (73391805).

166668099 is a wasteful number, since it uses less digits than its factorization.

166668099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13258.

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 166668099 is about 12909.9999612703. Note that the first 4 decimals coincide. The cubic root of 166668099 is about 550.3227846314.

The spelling of 166668099 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, ninety-nine".