66266513 has 2 divisors, whose sum is σ = 66266514. Its totient is φ = 66266512.

The previous prime is 66266507. The next prime is 66266533. The reversal of 66266513 is 31566266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60031504 + 6235009 = 7748^2 + 2497^2 .

It is a cyclic number.

It is not a de Polignac number, because 66266513 - 2¹⁶ = 66200977 is a prime.

It is not a weakly prime, because it can be changed into another prime (66266503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33133256 + 33133257.

It is an arithmetic number, because the mean of its divisors is an integer number (33133257).

Almost surely, 2^66266513 is an apocalyptic number.

It is an amenable number.

66266513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66266513 is an equidigital number, since it uses as much as digits as its factorization.

66266513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 66266513 is about 8140.4246203745. The cubic root of 66266513 is about 404.6672326269.

The spelling of 66266513 in words is "sixty-six million, two hundred sixty-six thousand, five hundred thirteen".