66633377 has 2 divisors, whose sum is σ = 66633378. Its totient is φ = 66633376.

The previous prime is 66633341. The next prime is 66633379. The reversal of 66633377 is 77333666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60202081 + 6431296 = 7759^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 66633377 - 2²⁰ = 65584801 is a prime.

Together with 66633379, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (66633379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33316688 + 33316689.

It is an arithmetic number, because the mean of its divisors is an integer number (33316689).

Almost surely, 2^66633377 is an apocalyptic number.

It is an amenable number.

66633377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66633377 is an equidigital number, since it uses as much as digits as its factorization.

66633377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 41.

The square root of 66633377 is about 8162.9269873006. The cubic root of 66633377 is about 405.4126303089.

It can be divided in two parts, 666 and 33377, that added together give a palindrome (34043).

The spelling of 66633377 in words is "sixty-six million, six hundred thirty-three thousand, three hundred seventy-seven".