66965711 has 4 divisors (see below), whose sum is σ = 67079232. Its totient is φ = 66852192.

The previous prime is 66965707. The next prime is 66965753. The reversal of 66965711 is 11756966.

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

It is a cyclic number.

It is not a de Polignac number, because 66965711 - 2² = 66965707 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 (66965761) 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, 55871 + ... + 57056.

It is an arithmetic number, because the mean of its divisors is an integer number (16769808).

Almost surely, 2^66965711 is an apocalyptic number.

66965711 is a deficient number, since it is larger than the sum of its proper divisors (113521).

66965711 is a wasteful number, since it uses less digits than its factorization.

66965711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113520.

The product of its digits is 68040, while the sum is 41.

The square root of 66965711 is about 8183.2579697820. The cubic root of 66965711 is about 406.0855114439.

It can be divided in two parts, 66965 and 711, that added together give a palindrome (67676).

The spelling of 66965711 in words is "sixty-six million, nine hundred sixty-five thousand, seven hundred eleven".