66570317129 has 2 divisors, whose sum is σ = 66570317130. Its totient is φ = 66570317128.

The previous prime is 66570317059. The next prime is 66570317159. The reversal of 66570317129 is 92171307566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48630393529 + 17939923600 = 220523^2 + 133940^2 .

It is a cyclic number.

It is not a de Polignac number, because 66570317129 - 2²⁰ = 66569268553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66570317159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285158564 + 33285158565.

It is an arithmetic number, because the mean of its divisors is an integer number (33285158565).

Almost surely, 2^66570317129 is an apocalyptic number.

It is an amenable number.

66570317129 is a deficient number, since it is larger than the sum of its proper divisors (1).

66570317129 is an equidigital number, since it uses as much as digits as its factorization.

66570317129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 47.

The spelling of 66570317129 in words is "sixty-six billion, five hundred seventy million, three hundred seventeen thousand, one hundred twenty-nine".