129128761613 has 12 divisors (see below), whose sum is σ = 133989625728. Its totient is φ = 124314727680.

The previous prime is 129128761607. The next prime is 129128761627. The reversal of 129128761613 is 316167821921.

It is not a de Polignac number, because 129128761613 - 2¹² = 129128757517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129128761633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1098806 + ... + 1210632.

It is an arithmetic number, because the mean of its divisors is an integer number (11165802144).

Almost surely, 2^129128761613 is an apocalyptic number.

It is an amenable number.

129128761613 is a deficient number, since it is larger than the sum of its proper divisors (4860864115).

129128761613 is an equidigital number, since it uses as much as digits as its factorization.

129128761613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112244 (or 112051 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The spelling of 129128761613 in words is "one hundred twenty-nine billion, one hundred twenty-eight million, seven hundred sixty-one thousand, six hundred thirteen".