66571103317 has 2 divisors, whose sum is σ = 66571103318. Its totient is φ = 66571103316.

The previous prime is 66571103281. The next prime is 66571103359. The reversal of 66571103317 is 71330117566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66226963716 + 344139601 = 257346^2 + 18551^2 .

It is a cyclic number.

It is not a de Polignac number, because 66571103317 - 2¹⁵ = 66571070549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66571103317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66571103387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285551658 + 33285551659.

It is an arithmetic number, because the mean of its divisors is an integer number (33285551659).

Almost surely, 2^66571103317 is an apocalyptic number.

It is an amenable number.

66571103317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571103317 is an equidigital number, since it uses as much as digits as its factorization.

66571103317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 66571103317 in words is "sixty-six billion, five hundred seventy-one million, one hundred three thousand, three hundred seventeen".