66513049 has 2 divisors, whose sum is σ = 66513050. Its totient is φ = 66513048.

The previous prime is 66513047. The next prime is 66513059. The reversal of 66513049 is 94031566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58247424 + 8265625 = 7632^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 66513049 - 2¹ = 66513047 is a prime.

Together with 66513047, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66513047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256524 + 33256525.

It is an arithmetic number, because the mean of its divisors is an integer number (33256525).

Almost surely, 2^66513049 is an apocalyptic number.

It is an amenable number.

66513049 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513049 is an equidigital number, since it uses as much as digits as its factorization.

66513049 is an evil number, because the sum of its binary digits is even.

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

The square root of 66513049 is about 8155.5532614287. The cubic root of 66513049 is about 405.1684489550.

The spelling of 66513049 in words is "sixty-six million, five hundred thirteen thousand, forty-nine".