66504913 has 2 divisors, whose sum is σ = 66504914. Its totient is φ = 66504912.

The previous prime is 66504899. The next prime is 66504943. The reversal of 66504913 is 31940566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39287824 + 27217089 = 6268^2 + 5217^2 .

It is a cyclic number.

It is not a de Polignac number, because 66504913 - 2⁵ = 66504881 is a prime.

It is not a weakly prime, because it can be changed into another prime (66504943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33252456 + 33252457.

It is an arithmetic number, because the mean of its divisors is an integer number (33252457).

Almost surely, 2^66504913 is an apocalyptic number.

It is an amenable number.

66504913 is a deficient number, since it is larger than the sum of its proper divisors (1).

66504913 is an equidigital number, since it uses as much as digits as its factorization.

66504913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66504913 is about 8155.0544449439. The cubic root of 66504913 is about 405.1519279617.

The spelling of 66504913 in words is "sixty-six million, five hundred four thousand, nine hundred thirteen".