129299617771 has 2 divisors, whose sum is σ = 129299617772. Its totient is φ = 129299617770.

The previous prime is 129299617723. The next prime is 129299617781. The reversal of 129299617771 is 177716992921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129299617771 - 2⁹ = 129299617259 is a prime.

It is not a weakly prime, because it can be changed into another prime (129299617781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64649808885 + 64649808886.

It is an arithmetic number, because the mean of its divisors is an integer number (64649808886).

Almost surely, 2^129299617771 is an apocalyptic number.

129299617771 is a deficient number, since it is larger than the sum of its proper divisors (1).

129299617771 is an equidigital number, since it uses as much as digits as its factorization.

129299617771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6001128, while the sum is 61.

The spelling of 129299617771 in words is "one hundred twenty-nine billion, two hundred ninety-nine million, six hundred seventeen thousand, seven hundred seventy-one".