66345643 has 8 divisors (see below), whose sum is σ = 81656288. Its totient is φ = 52493184.

The previous prime is 66345641. The next prime is 66345647. The reversal of 66345643 is 34654366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66345643 - 2¹ = 66345641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66345641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364446 + ... + 364627.

It is an arithmetic number, because the mean of its divisors is an integer number (10207036).

Almost surely, 2^66345643 is an apocalyptic number.

66345643 is a deficient number, since it is larger than the sum of its proper divisors (15310645).

66345643 is a wasteful number, since it uses less digits than its factorization.

66345643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729093.

The product of its digits is 155520, while the sum is 37.

The square root of 66345643 is about 8145.2834818685. The cubic root of 66345643 is about 404.8282419582.

The spelling of 66345643 in words is "sixty-six million, three hundred forty-five thousand, six hundred forty-three".