166663699 has 8 divisors (see below), whose sum is σ = 177083280. Its totient is φ = 156855328.

The previous prime is 166663697. The next prime is 166663723. The reversal of 166663699 is 996366661.

It is not a de Polignac number, because 166663699 - 2¹ = 166663697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166663691) 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, 12049 + ... + 21874.

It is an arithmetic number, because the mean of its divisors is an integer number (22135410).

Almost surely, 2^166663699 is an apocalyptic number.

166663699 is a deficient number, since it is larger than the sum of its proper divisors (10419581).

166663699 is an frugal number, since it uses more digits than its factorization.

166663699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33974 (or 33940 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 52.

The square root of 166663699 is about 12909.8295496106. The cubic root of 166663699 is about 550.3179417899.

The spelling of 166663699 in words is "one hundred sixty-six million, six hundred sixty-three thousand, six hundred ninety-nine".