66717038393 has 2 divisors, whose sum is σ = 66717038394. Its totient is φ = 66717038392.

The previous prime is 66717038383. The next prime is 66717038417. The reversal of 66717038393 is 39383071766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38528978944 + 28188059449 = 196288^2 + 167893^2 .

It is a cyclic number.

It is not a de Polignac number, because 66717038393 - 2¹² = 66717034297 is a prime.

It is not a weakly prime, because it can be changed into another prime (66717038383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33358519196 + 33358519197.

It is an arithmetic number, because the mean of its divisors is an integer number (33358519197).

Almost surely, 2^66717038393 is an apocalyptic number.

It is an amenable number.

66717038393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717038393 is an equidigital number, since it uses as much as digits as its factorization.

66717038393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 53.

The spelling of 66717038393 in words is "sixty-six billion, seven hundred seventeen million, thirty-eight thousand, three hundred ninety-three".