66664895959 has 2 divisors, whose sum is σ = 66664895960. Its totient is φ = 66664895958.

The previous prime is 66664895929. The next prime is 66664895989. The reversal of 66664895959 is 95959846666.

It is a balanced prime because it is at equal distance from previous prime (66664895929) and next prime (66664895989).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66664895959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66664895891 and 66664895900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66664895929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332447979 + 33332447980.

It is an arithmetic number, because the mean of its divisors is an integer number (33332447980).

Almost surely, 2^66664895959 is an apocalyptic number.

66664895959 is a deficient number, since it is larger than the sum of its proper divisors (1).

66664895959 is an equidigital number, since it uses as much as digits as its factorization.

66664895959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 755827200, while the sum is 73.

The spelling of 66664895959 in words is "sixty-six billion, six hundred sixty-four million, eight hundred ninety-five thousand, nine hundred fifty-nine".