66814897 has 2 divisors, whose sum is σ = 66814898. Its totient is φ = 66814896.

The previous prime is 66814877. The next prime is 66814921. The reversal of 66814897 is 79841866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 1382976 = 8089^2 + 1176^2 .

It is a cyclic number.

It is not a de Polignac number, because 66814897 - 2¹¹ = 66812849 is a prime.

It is a super-2 number, since 2×66814897² = 8928460922241218, which contains 22 as substring.

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 66814897.

It is not a weakly prime, because it can be changed into another prime (66814807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33407448 + 33407449.

It is an arithmetic number, because the mean of its divisors is an integer number (33407449).

Almost surely, 2^66814897 is an apocalyptic number.

It is an amenable number.

66814897 is a deficient number, since it is larger than the sum of its proper divisors (1).

66814897 is an equidigital number, since it uses as much as digits as its factorization.

66814897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 66814897 is about 8174.0379862098. The cubic root of 66814897 is about 405.7804328568.

The spelling of 66814897 in words is "sixty-six million, eight hundred fourteen thousand, eight hundred ninety-seven".