66986317 has 16 divisors (see below), whose sum is σ = 71792640. Its totient is φ = 62379072.

The previous prime is 66986291. The next prime is 66986321. The reversal of 66986317 is 71368966.

It is a cyclic number.

It is not a de Polignac number, because 66986317 - 2²³ = 58597709 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 (66906317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174708 + ... + 175090.

It is an arithmetic number, because the mean of its divisors is an integer number (4487040).

Almost surely, 2^66986317 is an apocalyptic number.

It is an amenable number.

66986317 is a deficient number, since it is larger than the sum of its proper divisors (4806323).

66986317 is a wasteful number, since it uses less digits than its factorization.

66986317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 326592, while the sum is 46.

The square root of 66986317 is about 8184.5169069408. The cubic root of 66986317 is about 406.1271593250.

The spelling of 66986317 in words is "sixty-six million, nine hundred eighty-six thousand, three hundred seventeen".