66865597039 has 2 divisors, whose sum is σ = 66865597040. Its totient is φ = 66865597038.

The previous prime is 66865597013. The next prime is 66865597177. The reversal of 66865597039 is 93079556866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66865597039 - 2²⁹ = 66328726127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66865595039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33432798519 + 33432798520.

It is an arithmetic number, because the mean of its divisors is an integer number (33432798520).

Almost surely, 2^66865597039 is an apocalyptic number.

66865597039 is a deficient number, since it is larger than the sum of its proper divisors (1).

66865597039 is an equidigital number, since it uses as much as digits as its factorization.

66865597039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73483200, while the sum is 64.

The spelling of 66865597039 in words is "sixty-six billion, eight hundred sixty-five million, five hundred ninety-seven thousand, thirty-nine".