66810345 has 64 divisors (see below), whose sum is σ = 130014720. Its totient is φ = 28643328.

The previous prime is 66810343. The next prime is 66810349. The reversal of 66810345 is 54301866.

It is not a de Polignac number, because 66810345 - 2¹ = 66810343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66810343) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112369 + ... + 112961.

It is an arithmetic number, because the mean of its divisors is an integer number (2031480).

Almost surely, 2^66810345 is an apocalyptic number.

It is an amenable number.

66810345 is a deficient number, since it is larger than the sum of its proper divisors (63204375).

66810345 is a wasteful number, since it uses less digits than its factorization.

66810345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66810345 is about 8173.7595389148. The cubic root of 66810345 is about 405.7712175741.

The spelling of 66810345 in words is "sixty-six million, eight hundred ten thousand, three hundred forty-five".