66868615027 has 2 divisors, whose sum is σ = 66868615028. Its totient is φ = 66868615026.

The previous prime is 66868614949. The next prime is 66868615043. The reversal of 66868615027 is 72051686866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66868615027 is a prime.

It is not a weakly prime, because it can be changed into another prime (66868615087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434307513 + 33434307514.

It is an arithmetic number, because the mean of its divisors is an integer number (33434307514).

Almost surely, 2^66868615027 is an apocalyptic number.

66868615027 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868615027 is an equidigital number, since it uses as much as digits as its factorization.

66868615027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 66868615027 in words is "sixty-six billion, eight hundred sixty-eight million, six hundred fifteen thousand, twenty-seven".