66686346 has 24 divisors (see below), whose sum is σ = 144655524. Its totient is φ = 22202880.

The previous prime is 66686329. The next prime is 66686351. The reversal of 66686346 is 64368666.

It can be written as a sum of positive squares in 2 ways, for example, as 44076321 + 22610025 = 6639^2 + 4755^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19690 + ... + 22826.

Almost surely, 2^66686346 is an apocalyptic number.

66686346 is an abundant number, since it is smaller than the sum of its proper divisors (77969178).

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

66686346 is a wasteful number, since it uses less digits than its factorization.

66686346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326 (or 4323 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 66686346 is about 8166.1708284850. The cubic root of 66686346 is about 405.5200270065.

The spelling of 66686346 in words is "sixty-six million, six hundred eighty-six thousand, three hundred forty-six".