66317779 has 8 divisors (see below), whose sum is σ = 72988272. Its totient is φ = 59754240.

The previous prime is 66317777. The next prime is 66317789. The reversal of 66317779 is 97771366.

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 not a de Polignac number, because 66317779 - 2¹ = 66317777 is a prime.

It is a super-2 number, since 2×66317779² = 8796095622985682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66317777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25434 + ... + 27919.

It is an arithmetic number, because the mean of its divisors is an integer number (9123534).

Almost surely, 2^66317779 is an apocalyptic number.

66317779 is a deficient number, since it is larger than the sum of its proper divisors (6670493).

66317779 is a wasteful number, since it uses less digits than its factorization.

66317779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53477.

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

The square root of 66317779 is about 8143.5728645356. The cubic root of 66317779 is about 404.7715604483.

The spelling of 66317779 in words is "sixty-six million, three hundred seventeen thousand, seven hundred seventy-nine".