66001566 has 16 divisors (see below), whose sum is σ = 133974144. Its totient is φ = 21672024.

The previous prime is 66001549. The next prime is 66001597. The reversal of 66001566 is 66510066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81690 + ... + 82493.

It is an arithmetic number, because the mean of its divisors is an integer number (8373384).

Almost surely, 2^66001566 is an apocalyptic number.

66001566 is an abundant number, since it is smaller than the sum of its proper divisors (67972578).

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

66001566 is a wasteful number, since it uses less digits than its factorization.

66001566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164255.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 66001566 is about 8124.1347847017. The cubic root of 66001566 is about 404.1271982904.

The spelling of 66001566 in words is "sixty-six million, one thousand, five hundred sixty-six".