66565607143 has 4 divisors (see below), whose sum is σ = 76074979600. Its totient is φ = 57056234688.

The previous prime is 66565607137. The next prime is 66565607149. The reversal of 66565607143 is 34170656566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34170656566 = 2 ⋅17085328283.

It is an interprime number because it is at equal distance from previous prime (66565607137) and next prime (66565607149).

It is a cyclic number.

It is not a de Polignac number, because 66565607143 - 2⁹ = 66565606631 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 (66565607149) 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, 4754686218 + ... + 4754686231.

It is an arithmetic number, because the mean of its divisors is an integer number (19018744900).

Almost surely, 2^66565607143 is an apocalyptic number.

66565607143 is a deficient number, since it is larger than the sum of its proper divisors (9509372457).

66565607143 is an equidigital number, since it uses as much as digits as its factorization.

66565607143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9509372456.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 66565607143 in words is "sixty-six billion, five hundred sixty-five million, six hundred seven thousand, one hundred forty-three".