66217316 has 24 divisors (see below), whose sum is σ = 126808416. Its totient is φ = 30005120.

The previous prime is 66217303. The next prime is 66217321. The reversal of 66217316 is 61371266.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13100 + ... + 17436.

It is an arithmetic number, because the mean of its divisors is an integer number (5283684).

Almost surely, 2^66217316 is an apocalyptic number.

It is an amenable number.

66217316 is a deficient number, since it is larger than the sum of its proper divisors (60591100).

66217316 is a wasteful number, since it uses less digits than its factorization.

66217316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699 (or 4697 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 66217316 is about 8137.4022881998. The cubic root of 66217316 is about 404.5670646752.

The spelling of 66217316 in words is "sixty-six million, two hundred seventeen thousand, three hundred sixteen".