66800297 has 2 divisors, whose sum is σ = 66800298. Its totient is φ = 66800296.

The previous prime is 66800291. The next prime is 66800339. The reversal of 66800297 is 79200866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49294441 + 17505856 = 7021^2 + 4184^2 .

It is a cyclic number.

It is not a de Polignac number, because 66800297 - 2⁶ = 66800233 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66800297.

It is not a weakly prime, because it can be changed into another prime (66800291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400148 + 33400149.

It is an arithmetic number, because the mean of its divisors is an integer number (33400149).

Almost surely, 2^66800297 is an apocalyptic number.

It is an amenable number.

66800297 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800297 is an equidigital number, since it uses as much as digits as its factorization.

66800297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 66800297 is about 8173.1448659619. The cubic root of 66800297 is about 405.7508744491.

The spelling of 66800297 in words is "sixty-six million, eight hundred thousand, two hundred ninety-seven".