66686316 has 24 divisors (see below), whose sum is σ = 155796480. Its totient is φ = 22200912.

The previous prime is 66686311. The next prime is 66686317. The reversal of 66686316 is 61368666.

It is not an unprimeable number, because it can be changed into a prime (66686311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8005 + ... + 14051.

It is an arithmetic number, because the mean of its divisors is an integer number (6491520).

Almost surely, 2^66686316 is an apocalyptic number.

It is an amenable number.

66686316 is an abundant number, since it is smaller than the sum of its proper divisors (89110164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66686316 is a wasteful number, since it uses less digits than its factorization.

66686316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973 (or 6971 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 66686316 is about 8166.1689916386. The cubic root of 66686316 is about 405.5199661965.

The spelling of 66686316 in words is "sixty-six million, six hundred eighty-six thousand, three hundred sixteen".