66743645 has 8 divisors (see below), whose sum is σ = 82854360. Its totient is φ = 51553600.

The previous prime is 66743641. The next prime is 66743647. The reversal of 66743645 is 54634766.

It can be written as a sum of positive squares in 4 ways, for example, as 3334276 + 63409369 = 1826^2 + 7963^2 .

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

It is not a de Polignac number, because 66743645 - 2² = 66743641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66743641) 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, 230006 + ... + 230295.

It is an arithmetic number, because the mean of its divisors is an integer number (10356795).

Almost surely, 2^66743645 is an apocalyptic number.

It is an amenable number.

66743645 is a deficient number, since it is larger than the sum of its proper divisors (16110715).

66743645 is a wasteful number, since it uses less digits than its factorization.

66743645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460335.

The product of its digits is 362880, while the sum is 41.

The square root of 66743645 is about 8169.6783902428. The cubic root of 66743645 is about 405.6361389325.

The spelling of 66743645 in words is "sixty-six million, seven hundred forty-three thousand, six hundred forty-five".