66253279 has 2 divisors, whose sum is σ = 66253280. Its totient is φ = 66253278.

The previous prime is 66253249. The next prime is 66253303. The reversal of 66253279 is 97235266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66253279 - 2¹¹ = 66251231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66253219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33126639 + 33126640.

It is an arithmetic number, because the mean of its divisors is an integer number (33126640).

Almost surely, 2^66253279 is an apocalyptic number.

66253279 is a deficient number, since it is larger than the sum of its proper divisors (1).

66253279 is an equidigital number, since it uses as much as digits as its factorization.

66253279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The square root of 66253279 is about 8139.6117229263. The cubic root of 66253279 is about 404.6402923094.

The spelling of 66253279 in words is "sixty-six million, two hundred fifty-three thousand, two hundred seventy-nine".