129288881252861 has 24 divisors (see below), whose sum is σ = 144148953430944. Its totient is φ = 114995333180000.

The previous prime is 129288881252851. The next prime is 129288881252941. The reversal of 129288881252861 is 168252188882921.

It is not a de Polignac number, because 129288881252861 - 2³⁴ = 129271701383677 is a prime.

It is a super-2 number, since 2×129288881252861² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129288881252851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1635110 + ... + 16163271.

It is an arithmetic number, because the mean of its divisors is an integer number (6006206392956).

Almost surely, 2^{129288881252861} is an apocalyptic number.

129288881252861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129288881252861 is a deficient number, since it is larger than the sum of its proper divisors (14860072178083).

129288881252861 is a wasteful number, since it uses less digits than its factorization.

129288881252861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17798665 (or 17798594 counting only the distinct ones).

The product of its digits is 141557760, while the sum is 71.

The spelling of 129288881252861 in words is "one hundred twenty-nine trillion, two hundred eighty-eight billion, eight hundred eighty-one million, two hundred fifty-two thousand, eight hundred sixty-one".