66170345 has 4 divisors (see below), whose sum is σ = 79404420. Its totient is φ = 52936272.

The previous prime is 66170323. The next prime is 66170347. The reversal of 66170345 is 54307166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54307166 = 2 ⋅27153583.

It can be written as a sum of positive squares in 2 ways, for example, as 7678441 + 58491904 = 2771^2 + 7648^2 .

It is a cyclic number.

It is not a de Polignac number, because 66170345 - 2⁶ = 66170281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66170347) 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 3 ways as a sum of consecutive naturals, for example, 6617030 + ... + 6617039.

It is an arithmetic number, because the mean of its divisors is an integer number (19851105).

Almost surely, 2^66170345 is an apocalyptic number.

It is an amenable number.

66170345 is a deficient number, since it is larger than the sum of its proper divisors (13234075).

66170345 is a wasteful number, since it uses less digits than its factorization.

66170345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13234074.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66170345 is about 8134.5156585995. The cubic root of 66170345 is about 404.4713826808.

The spelling of 66170345 in words is "sixty-six million, one hundred seventy thousand, three hundred forty-five".