66665580283807 has 4 divisors (see below), whose sum is σ = 67414631747760. Its totient is φ = 65916528819856.

The previous prime is 66665580283787. The next prime is 66665580283891. The reversal of 66665580283807 is 70838208556666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66665580283807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665580283607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374525731843 + ... + 374525732020.

It is an arithmetic number, because the mean of its divisors is an integer number (16853657936940).

Almost surely, 2^{66665580283807} is an apocalyptic number.

66665580283807 is a deficient number, since it is larger than the sum of its proper divisors (749051463953).

66665580283807 is an equidigital number, since it uses as much as digits as its factorization.

66665580283807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749051463952.

The product of its (nonzero) digits is 696729600, while the sum is 70.

The spelling of 66665580283807 in words is "sixty-six trillion, six hundred sixty-five billion, five hundred eighty million, two hundred eighty-three thousand, eight hundred seven".