66172946 has 16 divisors (see below), whose sum is σ = 116506176. Its totient is φ = 27593136.

The previous prime is 66172937. The next prime is 66172949. The reversal of 66172946 is 64927166.

66172946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66172949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63356 + ... + 64391.

It is an arithmetic number, because the mean of its divisors is an integer number (7281636).

Almost surely, 2^66172946 is an apocalyptic number.

66172946 is a deficient number, since it is larger than the sum of its proper divisors (50333230).

66172946 is a wasteful number, since it uses less digits than its factorization.

66172946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127793.

The product of its digits is 108864, while the sum is 41.

The square root of 66172946 is about 8134.6755313288. The cubic root of 66172946 is about 404.4766822163.

The spelling of 66172946 in words is "sixty-six million, one hundred seventy-two thousand, nine hundred forty-six".