66582261 has 12 divisors (see below), whose sum is σ = 96532800. Its totient is φ = 44222760.

The previous prime is 66582253. The next prime is 66582311. The reversal of 66582261 is 16228566.

It is not a de Polignac number, because 66582261 - 2³ = 66582253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66582211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11211 + ... + 16088.

It is an arithmetic number, because the mean of its divisors is an integer number (8044400).

Almost surely, 2^66582261 is an apocalyptic number.

It is an amenable number.

66582261 is a deficient number, since it is larger than the sum of its proper divisors (29950539).

66582261 is a wasteful number, since it uses less digits than its factorization.

66582261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27576 (or 27573 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 66582261 is about 8159.7954018468. The cubic root of 66582261 is about 405.3089366634.

The spelling of 66582261 in words is "sixty-six million, five hundred eighty-two thousand, two hundred sixty-one".