129888444561 has 8 divisors (see below), whose sum is σ = 173385273600. Its totient is φ = 86491955952.

The previous prime is 129888444551. The next prime is 129888444643. The reversal of 129888444561 is 165444888921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129888444561 - 2²² = 129884250257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129888444495 and 129888444504.

It is not an unprimeable number, because it can be changed into a prime (129888444551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25082086 + ... + 25087263.

It is an arithmetic number, because the mean of its divisors is an integer number (21673159200).

Almost surely, 2^129888444561 is an apocalyptic number.

It is an amenable number.

129888444561 is a deficient number, since it is larger than the sum of its proper divisors (43496829039).

129888444561 is an equidigital number, since it uses as much as digits as its factorization.

129888444561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50170215.

The product of its digits is 17694720, while the sum is 60.

The spelling of 129888444561 in words is "one hundred twenty-nine billion, eight hundred eighty-eight million, four hundred forty-four thousand, five hundred sixty-one".