66586566 has 8 divisors (see below), whose sum is σ = 133173144. Its totient is φ = 22195520.

The previous prime is 66586561. The next prime is 66586567. The reversal of 66586566 is 66568566.

It is a sphenic number, since it is the product of 3 distinct primes.

66586566 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66586561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5548875 + ... + 5548886.

It is an arithmetic number, because the mean of its divisors is an integer number (16646643).

Almost surely, 2^66586566 is an apocalyptic number.

66586566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66586566 is a wasteful number, since it uses less digits than its factorization.

66586566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11097766.

The product of its digits is 1555200, while the sum is 48.

The square root of 66586566 is about 8160.0591909618. The cubic root of 66586566 is about 405.3176718097.

The spelling of 66586566 in words is "sixty-six million, five hundred eighty-six thousand, five hundred sixty-six".