66660000697 has 2 divisors, whose sum is σ = 66660000698. Its totient is φ = 66660000696.

The previous prime is 66660000613. The next prime is 66660000703. The reversal of 66660000697 is 79600006666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62325621801 + 4334378896 = 249651^2 + 65836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660000697 is a prime.

It is not a weakly prime, because it can be changed into another prime (66660000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330000348 + 33330000349.

It is an arithmetic number, because the mean of its divisors is an integer number (33330000349).

Almost surely, 2^66660000697 is an apocalyptic number.

It is an amenable number.

66660000697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660000697 is an equidigital number, since it uses as much as digits as its factorization.

66660000697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 46.

The spelling of 66660000697 in words is "sixty-six billion, six hundred sixty million, six hundred ninety-seven", and thus it is an aban number.