66370517 has 2 divisors, whose sum is σ = 66370518. Its totient is φ = 66370516.

The previous prime is 66370511. The next prime is 66370529. The reversal of 66370517 is 71507366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53597041 + 12773476 = 7321^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 66370517 - 2¹⁰ = 66369493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66370511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33185258 + 33185259.

It is an arithmetic number, because the mean of its divisors is an integer number (33185259).

Almost surely, 2^66370517 is an apocalyptic number.

It is an amenable number.

66370517 is a deficient number, since it is larger than the sum of its proper divisors (1).

66370517 is an equidigital number, since it uses as much as digits as its factorization.

66370517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 66370517 is about 8146.8102346869. The cubic root of 66370517 is about 404.8788277443.

The spelling of 66370517 in words is "sixty-six million, three hundred seventy thousand, five hundred seventeen".