166499942399 has 8 divisors (see below), whose sum is σ = 191138949120. Its totient is φ = 142074260856.

The previous prime is 166499942327. The next prime is 166499942419. The reversal of 166499942399 is 993249994661.

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 166499942399 - 2⁸ = 166499942143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166499942099) 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, 53329619 + ... + 53332740.

It is an arithmetic number, because the mean of its divisors is an integer number (23892368640).

Almost surely, 2^166499942399 is an apocalyptic number.

166499942399 is a deficient number, since it is larger than the sum of its proper divisors (24639006721).

166499942399 is a wasteful number, since it uses less digits than its factorization.

166499942399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106662589.

The product of its digits is 204073344, while the sum is 71.

The spelling of 166499942399 in words is "one hundred sixty-six billion, four hundred ninety-nine million, nine hundred forty-two thousand, three hundred ninety-nine".