166532405 has 16 divisors (see below), whose sum is σ = 216793584. Its totient is φ = 122073600.

The previous prime is 166532381. The next prime is 166532407. The reversal of 166532405 is 504235661.

It can be written as a sum of positive squares in 8 ways, for example, as 25421764 + 141110641 = 5042^2 + 11879^2 .

It is not a de Polignac number, because 166532405 - 2¹⁸ = 166270261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166532407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446 + ... + 18255.

It is an arithmetic number, because the mean of its divisors is an integer number (13549599).

Almost surely, 2^166532405 is an apocalyptic number.

It is an amenable number.

166532405 is a deficient number, since it is larger than the sum of its proper divisors (50261179).

166532405 is a wasteful number, since it uses less digits than its factorization.

166532405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18856.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 166532405 is about 12904.7435077184. The cubic root of 166532405 is about 550.1733943653.

The spelling of 166532405 in words is "one hundred sixty-six million, five hundred thirty-two thousand, four hundred five".