66470339893 has 2 divisors, whose sum is σ = 66470339894. Its totient is φ = 66470339892.

The previous prime is 66470339891. The next prime is 66470339933. The reversal of 66470339893 is 39893307466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54206549329 + 12263790564 = 232823^2 + 110742^2 .

It is a cyclic number.

It is not a de Polignac number, because 66470339893 - 2¹ = 66470339891 is a prime.

Together with 66470339891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66470339891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33235169946 + 33235169947.

It is an arithmetic number, because the mean of its divisors is an integer number (33235169947).

Almost surely, 2^66470339893 is an apocalyptic number.

It is an amenable number.

66470339893 is a deficient number, since it is larger than the sum of its proper divisors (1).

66470339893 is an equidigital number, since it uses as much as digits as its factorization.

66470339893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17635968, while the sum is 58.

The spelling of 66470339893 in words is "sixty-six billion, four hundred seventy million, three hundred thirty-nine thousand, eight hundred ninety-three".