66522566 has 16 divisors (see below), whose sum is σ = 109414800. Its totient is φ = 30082080.

The previous prime is 66522557. The next prime is 66522569.

66522566 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66522569) 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, 3341 + ... + 12008.

It is an arithmetic number, because the mean of its divisors is an integer number (6838425).

Almost surely, 2^66522566 is an apocalyptic number.

66522566 is a deficient number, since it is larger than the sum of its proper divisors (42892234).

66522566 is a wasteful number, since it uses less digits than its factorization.

66522566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15559.

The product of its digits is 129600, while the sum is 38.

The square root of 66522566 is about 8156.1367080254. The cubic root of 66522566 is about 405.1877725027.

The spelling of 66522566 in words is "sixty-six million, five hundred twenty-two thousand, five hundred sixty-six".