164166399 has 16 divisors (see below), whose sum is σ = 257516640. Its totient is φ = 103006080.

The previous prime is 164166397. The next prime is 164166427. The reversal of 164166399 is 993661461.

164166399 is a `hidden beast` number, since 1 + 6 + 4 + 1 + 6 + 639 + 9 = 666.

It is not a de Polignac number, because 164166399 - 2¹ = 164166397 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164166397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178372 + ... + 179289.

It is an arithmetic number, because the mean of its divisors is an integer number (16094790).

Almost surely, 2^164166399 is an apocalyptic number.

164166399 is a deficient number, since it is larger than the sum of its proper divisors (93350241).

164166399 is a wasteful number, since it uses less digits than its factorization.

164166399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357687 (or 357681 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 164166399 is about 12812.7436171961. The cubic root of 164166399 is about 547.5554306798. Note that the first 3 decimals are identical.

The spelling of 164166399 in words is "one hundred sixty-four million, one hundred sixty-six thousand, three hundred ninety-nine".