66717509711 has 4 divisors (see below), whose sum is σ = 66719597112. Its totient is φ = 66715422312.

The previous prime is 66717509689. The next prime is 66717509713. The reversal of 66717509711 is 11790571766.

66717509711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11790571766 = 2 ⋅5895285883.

It is a cyclic number.

It is not a de Polignac number, because 66717509711 - 2³⁴ = 49537640527 is a prime.

It is a super-2 number, since 2×66717509711² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66717509711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717509713) 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, 995000 + ... + 1059933.

It is an arithmetic number, because the mean of its divisors is an integer number (16679899278).

Almost surely, 2^66717509711 is an apocalyptic number.

66717509711 is a deficient number, since it is larger than the sum of its proper divisors (2087401).

66717509711 is a wasteful number, since it uses less digits than its factorization.

66717509711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087400.

The product of its (nonzero) digits is 555660, while the sum is 50.

The spelling of 66717509711 in words is "sixty-six billion, seven hundred seventeen million, five hundred nine thousand, seven hundred eleven".