66264439 has 2 divisors, whose sum is σ = 66264440. Its totient is φ = 66264438.

The previous prime is 66264437. The next prime is 66264491. The reversal of 66264439 is 93446266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66264439 - 2¹ = 66264437 is a prime.

Together with 66264437, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66264437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33132219 + 33132220.

It is an arithmetic number, because the mean of its divisors is an integer number (33132220).

Almost surely, 2^66264439 is an apocalyptic number.

66264439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66264439 is an equidigital number, since it uses as much as digits as its factorization.

66264439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 40.

The square root of 66264439 is about 8140.2972304456. The cubic root of 66264439 is about 404.6630108435.

The spelling of 66264439 in words is "sixty-six million, two hundred sixty-four thousand, four hundred thirty-nine".