166363399 has 4 divisors (see below), whose sum is σ = 166466664. Its totient is φ = 166260136.

The previous prime is 166363397. The next prime is 166363429. The reversal of 166363399 is 993363661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993363661 = 19319 ⋅51419.

It is a cyclic number.

It is not a de Polignac number, because 166363399 - 2¹ = 166363397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166363397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49177 + ... + 52450.

It is an arithmetic number, because the mean of its divisors is an integer number (41616666).

Almost surely, 2^166363399 is an apocalyptic number.

166363399 is a deficient number, since it is larger than the sum of its proper divisors (103265).

166363399 is a wasteful number, since it uses less digits than its factorization.

166363399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103264.

The product of its digits is 472392, while the sum is 46.

The square root of 166363399 is about 12898.1936332186. The cubic root of 166363399 is about 549.9872162318.

The spelling of 166363399 in words is "one hundred sixty-six million, three hundred sixty-three thousand, three hundred ninety-nine".