66779317 has 8 divisors (see below), whose sum is σ = 72919872. Its totient is φ = 60650400.

The previous prime is 66779299. The next prime is 66779333. The reversal of 66779317 is 71397766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66779317 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 (66779017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12817 + ... + 17257.

It is an arithmetic number, because the mean of its divisors is an integer number (9114984).

Almost surely, 2^66779317 is an apocalyptic number.

It is an amenable number.

66779317 is a deficient number, since it is larger than the sum of its proper divisors (6140555).

66779317 is a wasteful number, since it uses less digits than its factorization.

66779317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819.

The product of its digits is 333396, while the sum is 46.

The square root of 66779317 is about 8171.8612934875. The cubic root of 66779317 is about 405.7083918800.

The spelling of 66779317 in words is "sixty-six million, seven hundred seventy-nine thousand, three hundred seventeen".