66497699 has 2 divisors, whose sum is σ = 66497700. Its totient is φ = 66497698.

The previous prime is 66497653. The next prime is 66497723. The reversal of 66497699 is 99679466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66497699 - 2²⁴ = 49720483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66467699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33248849 + 33248850.

It is an arithmetic number, because the mean of its divisors is an integer number (33248850).

Almost surely, 2^66497699 is an apocalyptic number.

66497699 is a deficient number, since it is larger than the sum of its proper divisors (1).

66497699 is an equidigital number, since it uses as much as digits as its factorization.

66497699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 56.

The square root of 66497699 is about 8154.6121305676. The cubic root of 66497699 is about 405.1372780581.

The spelling of 66497699 in words is "sixty-six million, four hundred ninety-seven thousand, six hundred ninety-nine".