66887317 has 16 divisors (see below), whose sum is σ = 78579072.
Its totient is φ = 55742400.
The previous prime is 66887309. The next prime is 66887329. The reversal of 66887317 is 71378866.
It is not a de Polignac number, because 66887317 - 23 = 66887309 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 (66887347) 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 15 ways as a sum of consecutive naturals, for example, 95067 + ... + 95767.
It is an arithmetic number, because the mean of its divisors is an integer number (4911192).
Almost surely, 266887317 is an apocalyptic number.
It is an amenable number.
66887317 is a deficient number, since it is larger than the sum of its proper divisors (11691755).
66887317 is a wasteful number, since it uses less digits than its factorization.
66887317 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1068.
The product of its digits is 338688, while the sum is 46.
The square root of 66887317 is about 8178.4666655798.
The cubic root of 66887317 is about 405.9269870404.
The spelling of 66887317 in words is "sixty-six million, eight hundred eighty-seven thousand, three hundred seventeen".