166564542 has 16 divisors (see below), whose sum is σ = 340876800. Its totient is φ = 54230232.

The previous prime is 166564537. The next prime is 166564543. The reversal of 166564542 is 245465661.

It is a self number, because there is not a number n which added to its sum of digits gives 166564542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166564543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322542 + ... + 323057.

It is an arithmetic number, because the mean of its divisors is an integer number (21304800).

Almost surely, 2^166564542 is an apocalyptic number.

166564542 is an abundant number, since it is smaller than the sum of its proper divisors (174312258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166564542 is a wasteful number, since it uses less digits than its factorization.

166564542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645647.

The product of its digits is 172800, while the sum is 39.

The square root of 166564542 is about 12905.9886099438. The cubic root of 166564542 is about 550.2087824432.

The spelling of 166564542 in words is "one hundred sixty-six million, five hundred sixty-four thousand, five hundred forty-two".