66334257065 has 4 divisors (see below), whose sum is σ = 79601108484. Its totient is φ = 53067405648.

The previous prime is 66334257047. The next prime is 66334257089. The reversal of 66334257065 is 56075243366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15552085264 + 50782171801 = 124708^2 + 225349^2 .

It is a cyclic number.

It is not a de Polignac number, because 66334257065 - 2⁸ = 66334256809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6633425702 + ... + 6633425711.

It is an arithmetic number, because the mean of its divisors is an integer number (19900277121).

Almost surely, 2^66334257065 is an apocalyptic number.

It is an amenable number.

66334257065 is a deficient number, since it is larger than the sum of its proper divisors (13266851419).

66334257065 is a wasteful number, since it uses less digits than its factorization.

66334257065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13266851418.

The product of its (nonzero) digits is 2721600, while the sum is 47.

The spelling of 66334257065 in words is "sixty-six billion, three hundred thirty-four million, two hundred fifty-seven thousand, sixty-five".