166125566 has 4 divisors (see below), whose sum is σ = 249188352. Its totient is φ = 83062782.

The previous prime is 166125551. The next prime is 166125577. The reversal of 166125566 is 665521661.

166125566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41531390 + ... + 41531393.

It is an arithmetic number, because the mean of its divisors is an integer number (62297088).

Almost surely, 2^166125566 is an apocalyptic number.

166125566 is a deficient number, since it is larger than the sum of its proper divisors (83062786).

166125566 is an equidigital number, since it uses as much as digits as its factorization.

166125566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83062785.

The product of its digits is 64800, while the sum is 38.

The square root of 166125566 is about 12888.9707114261. The cubic root of 166125566 is about 549.7250041248.

The spelling of 166125566 in words is "one hundred sixty-six million, one hundred twenty-five thousand, five hundred sixty-six".