66280566 has 32 divisors (see below), whose sum is σ = 145224576. Its totient is φ = 20000000.

The previous prime is 66280553. The next prime is 66280589. The reversal of 66280566 is 66508266.

It is a super-2 number, since 2×66280566² = 8786226858560712, which contains 22 as substring.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 14566 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (4538268).

Almost surely, 2^66280566 is an apocalyptic number.

66280566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66280566 is an abundant number, since it is smaller than the sum of its proper divisors (78944010).

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

66280566 is a wasteful number, since it uses less digits than its factorization.

66280566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 66280566 is about 8141.2877359789. The cubic root of 66280566 is about 404.6958362479.

The spelling of 66280566 in words is "sixty-six million, two hundred eighty thousand, five hundred sixty-six".