66779313 has 4 divisors (see below), whose sum is σ = 89039088. Its totient is φ = 44519540.

The previous prime is 66779299. The next prime is 66779333. The reversal of 66779313 is 31397766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66779313 - 2¹⁰ = 66778289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66779333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11129883 + ... + 11129888.

It is an arithmetic number, because the mean of its divisors is an integer number (22259772).

Almost surely, 2^66779313 is an apocalyptic number.

It is an amenable number.

66779313 is a deficient number, since it is larger than the sum of its proper divisors (22259775).

66779313 is a wasteful number, since it uses less digits than its factorization.

66779313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22259774.

The product of its digits is 142884, while the sum is 42.

The square root of 66779313 is about 8171.8610487453. The cubic root of 66779313 is about 405.7083837795.

The spelling of 66779313 in words is "sixty-six million, seven hundred seventy-nine thousand, three hundred thirteen".