66306261 has 24 divisors (see below), whose sum is σ = 104307264. Its totient is φ = 37349760.

The previous prime is 66306259. The next prime is 66306269. The reversal of 66306261 is 16260366.

It is not a de Polignac number, because 66306261 - 2¹ = 66306259 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 (66306269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7261 + ... + 13613.

It is an arithmetic number, because the mean of its divisors is an integer number (4346136).

Almost surely, 2^66306261 is an apocalyptic number.

It is an amenable number.

66306261 is a deficient number, since it is larger than the sum of its proper divisors (38001003).

66306261 is a wasteful number, since it uses less digits than its factorization.

66306261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6441 (or 6434 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66306261 is about 8142.8656503715. The cubic root of 66306261 is about 404.7481256629.

The spelling of 66306261 in words is "sixty-six million, three hundred six thousand, two hundred sixty-one".