66969713 has 2 divisors, whose sum is σ = 66969714. Its totient is φ = 66969712.

The previous prime is 66969677. The next prime is 66969731. The reversal of 66969713 is 31796966.

It is a happy number.

Together with next prime (66969731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56806369 + 10163344 = 7537^2 + 3188^2 .

It is a cyclic number.

It is not a de Polignac number, because 66969713 - 2¹⁴ = 66953329 is a prime.

It is not a weakly prime, because it can be changed into another prime (66969013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33484856 + 33484857.

It is an arithmetic number, because the mean of its divisors is an integer number (33484857).

Almost surely, 2^66969713 is an apocalyptic number.

It is an amenable number.

66969713 is a deficient number, since it is larger than the sum of its proper divisors (1).

66969713 is an equidigital number, since it uses as much as digits as its factorization.

66969713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 66969713 is about 8183.5024897656. The cubic root of 66969713 is about 406.0936007671.

The spelling of 66969713 in words is "sixty-six million, nine hundred sixty-nine thousand, seven hundred thirteen".