66532566 has 16 divisors (see below), whose sum is σ = 140068800. Its totient is φ = 21010248.

The previous prime is 66532519. The next prime is 66532597. The reversal of 66532566 is 66523566.

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, 291696 + ... + 291923.

It is an arithmetic number, because the mean of its divisors is an integer number (8754300).

Almost surely, 2^66532566 is an apocalyptic number.

66532566 is an abundant number, since it is smaller than the sum of its proper divisors (73536234).

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

66532566 is a wasteful number, since it uses less digits than its factorization.

66532566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583643.

The product of its digits is 194400, while the sum is 39.

The square root of 66532566 is about 8156.7497203237. The cubic root of 66532566 is about 405.2080747598.

The spelling of 66532566 in words is "sixty-six million, five hundred thirty-two thousand, five hundred sixty-six".