65666347 has 8 divisors (see below), whose sum is σ = 66707744. Its totient is φ = 64628928.

The previous prime is 65666323. The next prime is 65666371. The reversal of 65666347 is 74366656.

It is an interprime number because it is at equal distance from previous prime (65666323) and next prime (65666371).

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 65666347 - 2¹¹ = 65664299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65666387) 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, 59533 + ... + 60625.

It is an arithmetic number, because the mean of its divisors is an integer number (8338468).

Almost surely, 2^65666347 is an apocalyptic number.

65666347 is a deficient number, since it is larger than the sum of its proper divisors (1041397).

65666347 is a wasteful number, since it uses less digits than its factorization.

65666347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989.

The product of its digits is 544320, while the sum is 43.

The square root of 65666347 is about 8103.4774634104. The cubic root of 65666347 is about 403.4418553840.

The spelling of 65666347 in words is "sixty-five million, six hundred sixty-six thousand, three hundred forty-seven".