66641072699 has 2 divisors, whose sum is σ = 66641072700. Its totient is φ = 66641072698.

The previous prime is 66641072681. The next prime is 66641072723. The reversal of 66641072699 is 99627014666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66641072699 - 2²⁴ = 66624295483 is a prime.

It is not a weakly prime, because it can be changed into another prime (66641072669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33320536349 + 33320536350.

It is an arithmetic number, because the mean of its divisors is an integer number (33320536350).

Almost surely, 2^66641072699 is an apocalyptic number.

66641072699 is a deficient number, since it is larger than the sum of its proper divisors (1).

66641072699 is an equidigital number, since it uses as much as digits as its factorization.

66641072699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 66641072699 in words is "sixty-six billion, six hundred forty-one million, seventy-two thousand, six hundred ninety-nine".