66451289 has 2 divisors, whose sum is σ = 66451290. Its totient is φ = 66451288.

The previous prime is 66451277. The next prime is 66451291. The reversal of 66451289 is 98215466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60715264 + 5736025 = 7792^2 + 2395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66451289 is a prime.

Together with 66451291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66451219) 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, 33225644 + 33225645.

It is an arithmetic number, because the mean of its divisors is an integer number (33225645).

Almost surely, 2^66451289 is an apocalyptic number.

It is an amenable number.

66451289 is a deficient number, since it is larger than the sum of its proper divisors (1).

66451289 is an equidigital number, since it uses as much as digits as its factorization.

66451289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 66451289 is about 8151.7660049832. The cubic root of 66451289 is about 405.0430051371.

The spelling of 66451289 in words is "sixty-six million, four hundred fifty-one thousand, two hundred eighty-nine".