66195707801 has 2 divisors, whose sum is σ = 66195707802. Its totient is φ = 66195707800.

The previous prime is 66195707749. The next prime is 66195707833. The reversal of 66195707801 is 10870759166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45146050576 + 21049657225 = 212476^2 + 145085^2 .

It is a cyclic number.

It is not a de Polignac number, because 66195707801 - 2¹⁰ = 66195706777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66195707801.

It is not a weakly prime, because it can be changed into another prime (66195707861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33097853900 + 33097853901.

It is an arithmetic number, because the mean of its divisors is an integer number (33097853901).

Almost surely, 2^66195707801 is an apocalyptic number.

It is an amenable number.

66195707801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66195707801 is an equidigital number, since it uses as much as digits as its factorization.

66195707801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 66195707801 in words is "sixty-six billion, one hundred ninety-five million, seven hundred seven thousand, eight hundred one".