166666499 has 8 divisors (see below), whose sum is σ = 175800000. Its totient is φ = 157569192.

The previous prime is 166666481. The next prime is 166666547. The reversal of 166666499 is 994666661.

166666499 = T₂ + T₃ + ... + T₉₉₉.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166666499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166666499.

It is not an unprimeable number, because it can be changed into a prime (166666469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692 + ... + 18270.

It is an arithmetic number, because the mean of its divisors is an integer number (21975000).

Almost surely, 2^166666499 is an apocalyptic number.

166666499 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166666499 is a deficient number, since it is larger than the sum of its proper divisors (9133501).

166666499 is a wasteful number, since it uses less digits than its factorization.

166666499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18097.

The product of its digits is 2519424, while the sum is 53.

The square root of 166666499 is about 12909.9379936543. The cubic root of 166666499 is about 550.3210236080.

The spelling of 166666499 in words is "one hundred sixty-six million, six hundred sixty-six thousand, four hundred ninety-nine".