66726713 has 2 divisors, whose sum is σ = 66726714. Its totient is φ = 66726712.

The previous prime is 66726701. The next prime is 66726719. The reversal of 66726713 is 31762766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59799289 + 6927424 = 7733^2 + 2632^2 .

It is a cyclic number.

It is not a de Polignac number, because 66726713 - 2⁴ = 66726697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_3936629 and since 66726713 and 3936629 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66726719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33363356 + 33363357.

It is an arithmetic number, because the mean of its divisors is an integer number (33363357).

Almost surely, 2^66726713 is an apocalyptic number.

It is an amenable number.

66726713 is a deficient number, since it is larger than the sum of its proper divisors (1).

66726713 is an equidigital number, since it uses as much as digits as its factorization.

66726713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 66726713 is about 8168.6420536096. The cubic root of 66726713 is about 405.6018344831.

The spelling of 66726713 in words is "sixty-six million, seven hundred twenty-six thousand, seven hundred thirteen".