166704399 has 20 divisors (see below), whose sum is σ = 253117480. Its totient is φ = 109311120.

The previous prime is 166704389. The next prime is 166704409. The reversal of 166704399 is 993407661.

It is an interprime number because it is at equal distance from previous prime (166704389) and next prime (166704409).

It is not a de Polignac number, because 166704399 - 2¹⁶ = 166638863 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 (166704389) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11929 + ... + 21810.

It is an arithmetic number, because the mean of its divisors is an integer number (12655874).

Almost surely, 2^166704399 is an apocalyptic number.

166704399 is a deficient number, since it is larger than the sum of its proper divisors (86413081).

166704399 is an equidigital number, since it uses as much as digits as its factorization.

166704399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33812 (or 33803 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 166704399 is about 12911.4057716424. The cubic root of 166704399 is about 550.3627348220.

The spelling of 166704399 in words is "one hundred sixty-six million, seven hundred four thousand, three hundred ninety-nine".