66520706711 has 4 divisors (see below), whose sum is σ = 66527258400. Its totient is φ = 66514155024.

The previous prime is 66520706689. The next prime is 66520706741. The reversal of 66520706711 is 11760702566.

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-66520706711 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 (66520706741) 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, 3260591 + ... + 3280928.

It is an arithmetic number, because the mean of its divisors is an integer number (16631814600).

Almost surely, 2^66520706711 is an apocalyptic number.

66520706711 is a deficient number, since it is larger than the sum of its proper divisors (6551689).

66520706711 is a wasteful number, since it uses less digits than its factorization.

66520706711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551688.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 66520706711 in words is "sixty-six billion, five hundred twenty million, seven hundred six thousand, seven hundred eleven".