66513373 has 2 divisors, whose sum is σ = 66513374. Its totient is φ = 66513372.

The previous prime is 66513371. The next prime is 66513479. The reversal of 66513373 is 37331566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65318724 + 1194649 = 8082^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 66513373 - 2¹ = 66513371 is a prime.

Together with 66513371, 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 (66513371) 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, 33256686 + 33256687.

It is an arithmetic number, because the mean of its divisors is an integer number (33256687).

Almost surely, 2^66513373 is an apocalyptic number.

It is an amenable number.

66513373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513373 is an equidigital number, since it uses as much as digits as its factorization.

66513373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 34.

The square root of 66513373 is about 8155.5731251703. The cubic root of 66513373 is about 405.1691068428.

The spelling of 66513373 in words is "sixty-six million, five hundred thirteen thousand, three hundred seventy-three".