66897013 has 2 divisors, whose sum is σ = 66897014. Its totient is φ = 66897012.

The previous prime is 66897011. The next prime is 66897059. The reversal of 66897013 is 31079866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47032164 + 19864849 = 6858^2 + 4457^2 .

It is a cyclic number.

It is not a de Polignac number, because 66897013 - 2¹ = 66897011 is a prime.

Together with 66897011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66897011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33448506 + 33448507.

It is an arithmetic number, because the mean of its divisors is an integer number (33448507).

Almost surely, 2^66897013 is an apocalyptic number.

It is an amenable number.

66897013 is a deficient number, since it is larger than the sum of its proper divisors (1).

66897013 is an equidigital number, since it uses as much as digits as its factorization.

66897013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66897013 is about 8179.0594202512. The cubic root of 66897013 is about 405.9466005141.

The spelling of 66897013 in words is "sixty-six million, eight hundred ninety-seven thousand, thirteen".