129591577721 has 16 divisors (see below), whose sum is σ = 132399886080. Its totient is φ = 126804845520.

The previous prime is 129591577699. The next prime is 129591577723. The reversal of 129591577721 is 127775195921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129591577721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129591577723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14250386 + ... + 14259476.

It is an arithmetic number, because the mean of its divisors is an integer number (8274992880).

Almost surely, 2^129591577721 is an apocalyptic number.

It is an amenable number.

129591577721 is a deficient number, since it is larger than the sum of its proper divisors (2808308359).

129591577721 is an equidigital number, since it uses as much as digits as its factorization.

129591577721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244.

The product of its digits is 2778300, while the sum is 56.

The spelling of 129591577721 in words is "one hundred twenty-nine billion, five hundred ninety-one million, five hundred seventy-seven thousand, seven hundred twenty-one".