66172345 has 16 divisors (see below), whose sum is σ = 86472000. Its totient is φ = 48420288.

The previous prime is 66172291. The next prime is 66172361. The reversal of 66172345 is 54327166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66172345 - 2¹¹ = 66170297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66172345.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9255 + ... + 14764.

It is an arithmetic number, because the mean of its divisors is an integer number (5404500).

Almost surely, 2^66172345 is an apocalyptic number.

It is an amenable number.

66172345 is a deficient number, since it is larger than the sum of its proper divisors (20299655).

66172345 is a wasteful number, since it uses less digits than its factorization.

66172345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24072.

The product of its digits is 30240, while the sum is 34.

The square root of 66172345 is about 8134.6385906197. The cubic root of 66172345 is about 404.4754576916.

The spelling of 66172345 in words is "sixty-six million, one hundred seventy-two thousand, three hundred forty-five".