66968311 has 4 divisors (see below), whose sum is σ = 67003624. Its totient is φ = 66933000.

The previous prime is 66968299. The next prime is 66968347. The reversal of 66968311 is 11386966.

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 66968311 - 2¹³ = 66960119 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 (66968381) 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, 14640 + ... + 18661.

It is an arithmetic number, because the mean of its divisors is an integer number (16750906).

Almost surely, 2^66968311 is an apocalyptic number.

66968311 is a deficient number, since it is larger than the sum of its proper divisors (35313).

66968311 is a wasteful number, since it uses less digits than its factorization.

66968311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35312.

The product of its digits is 46656, while the sum is 40.

The square root of 66968311 is about 8183.4168291735. The cubic root of 66968311 is about 406.0907669130.

The spelling of 66968311 in words is "sixty-six million, nine hundred sixty-eight thousand, three hundred eleven".