66736739807893 has 2 divisors, whose sum is σ = 66736739807894. Its totient is φ = 66736739807892.

The previous prime is 66736739807849. The next prime is 66736739808047. The reversal of 66736739807893 is 39870893763766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65998449867249 + 738289940644 = 8123943^2 + 859238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66736739807893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66736739807693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368369903946 + 33368369903947.

It is an arithmetic number, because the mean of its divisors is an integer number (33368369903947).

Almost surely, 2^{66736739807893} is an apocalyptic number.

It is an amenable number.

66736739807893 is a deficient number, since it is larger than the sum of its proper divisors (1).

66736739807893 is an equidigital number, since it uses as much as digits as its factorization.

66736739807893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10369949184, while the sum is 82.

The spelling of 66736739807893 in words is "sixty-six trillion, seven hundred thirty-six billion, seven hundred thirty-nine million, eight hundred seven thousand, eight hundred ninety-three".