129275552665 has 32 divisors (see below), whose sum is σ = 180952300800. Its totient is φ = 88625561472.

The previous prime is 129275552639. The next prime is 129275552677. The reversal of 129275552665 is 566255572921.

It is not a de Polignac number, because 129275552665 - 2¹¹ = 129275550617 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 13401334 + ... + 13410976.

It is an arithmetic number, because the mean of its divisors is an integer number (5654759400).

Almost surely, 2^129275552665 is an apocalyptic number.

It is an amenable number.

129275552665 is a deficient number, since it is larger than the sum of its proper divisors (51676748135).

129275552665 is an frugal number, since it uses more digits than its factorization.

129275552665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17486 (or 17472 counting only the distinct ones).

The product of its digits is 11340000, while the sum is 55.

The spelling of 129275552665 in words is "one hundred twenty-nine billion, two hundred seventy-five million, five hundred fifty-two thousand, six hundred sixty-five".