66275611 has 2 divisors, whose sum is σ = 66275612. Its totient is φ = 66275610.

The previous prime is 66275609. The next prime is 66275623. The reversal of 66275611 is 11657266.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66275611 - 2¹ = 66275609 is a prime.

It is a super-3 number, since 3×66275611³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 66275609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66272611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33137805 + 33137806.

It is an arithmetic number, because the mean of its divisors is an integer number (33137806).

Almost surely, 2^66275611 is an apocalyptic number.

66275611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66275611 is an equidigital number, since it uses as much as digits as its factorization.

66275611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 66275611 is about 8140.9834172537. The cubic root of 66275611 is about 404.6857512514.

The spelling of 66275611 in words is "sixty-six million, two hundred seventy-five thousand, six hundred eleven".