66898968907 has 2 divisors, whose sum is σ = 66898968908. Its totient is φ = 66898968906.

The previous prime is 66898968901. The next prime is 66898968937. The reversal of 66898968907 is 70986989866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66898968907 is a prime.

It is not a weakly prime, because it can be changed into another prime (66898968901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33449484453 + 33449484454.

It is an arithmetic number, because the mean of its divisors is an integer number (33449484454).

Almost surely, 2^66898968907 is an apocalyptic number.

66898968907 is a deficient number, since it is larger than the sum of its proper divisors (1).

66898968907 is an equidigital number, since it uses as much as digits as its factorization.

66898968907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564350976, while the sum is 76.

The spelling of 66898968907 in words is "sixty-six billion, eight hundred ninety-eight million, nine hundred sixty-eight thousand, nine hundred seven".