66775017 has 4 divisors (see below), whose sum is σ = 89033360. Its totient is φ = 44516676.

The previous prime is 66775013. The next prime is 66775043. The reversal of 66775017 is 71057766.

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 not a de Polignac number, because 66775017 - 2² = 66775013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66775013) 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 3 ways as a sum of consecutive naturals, for example, 11129167 + ... + 11129172.

It is an arithmetic number, because the mean of its divisors is an integer number (22258340).

Almost surely, 2^66775017 is an apocalyptic number.

It is an amenable number.

66775017 is a deficient number, since it is larger than the sum of its proper divisors (22258343).

66775017 is a wasteful number, since it uses less digits than its factorization.

66775017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22258342.

The product of its (nonzero) digits is 61740, while the sum is 39.

The square root of 66775017 is about 8171.5981912965. The cubic root of 66775017 is about 405.6996836771.

The spelling of 66775017 in words is "sixty-six million, seven hundred seventy-five thousand, seventeen".