129666577 has 2 divisors, whose sum is σ = 129666578. Its totient is φ = 129666576.

The previous prime is 129666533. The next prime is 129666637. The reversal of 129666577 is 775666921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116985856 + 12680721 = 10816^2 + 3561^2 .

It is a cyclic number.

It is not a de Polignac number, because 129666577 - 2¹¹ = 129664529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129666577.

It is not a weakly prime, because it can be changed into another prime (129666517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64833288 + 64833289.

It is an arithmetic number, because the mean of its divisors is an integer number (64833289).

Almost surely, 2^129666577 is an apocalyptic number.

It is an amenable number.

129666577 is a deficient number, since it is larger than the sum of its proper divisors (1).

129666577 is an equidigital number, since it uses as much as digits as its factorization.

129666577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The square root of 129666577 is about 11387.1232978308. The cubic root of 129666577 is about 506.1462405449.

The spelling of 129666577 in words is "one hundred twenty-nine million, six hundred sixty-six thousand, five hundred seventy-seven".