6666712397 has 2 divisors, whose sum is σ = 6666712398. Its totient is φ = 6666712396.

The previous prime is 6666712373. The next prime is 6666712433. The reversal of 6666712397 is 7932176666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3700167241 + 2966545156 = 60829^2 + 54466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666712397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666712597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333356198 + 3333356199.

It is an arithmetic number, because the mean of its divisors is an integer number (3333356199).

Almost surely, 2^6666712397 is an apocalyptic number.

It is an amenable number.

6666712397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666712397 is an equidigital number, since it uses as much as digits as its factorization.

6666712397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 53.

The square root of 6666712397 is about 81649.9381322485. The cubic root of 6666712397 is about 1882.0763611413.

The spelling of 6666712397 in words is "six billion, six hundred sixty-six million, seven hundred twelve thousand, three hundred ninety-seven".