129056634427 has 8 divisors (see below), whose sum is σ = 156169372896. Its totient is φ = 104112915072.

The previous prime is 129056634407. The next prime is 129056634449. The reversal of 129056634427 is 724436650921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129056634427 is a prime.

It is a super-2 number, since 2×129056634427² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129056634407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542254648 + ... + 542254885.

It is an arithmetic number, because the mean of its divisors is an integer number (19521171612).

Almost surely, 2^129056634427 is an apocalyptic number.

129056634427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

129056634427 is a deficient number, since it is larger than the sum of its proper divisors (27112738469).

129056634427 is a wasteful number, since it uses less digits than its factorization.

129056634427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084509557.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 129056634427 in words is "one hundred twenty-nine billion, fifty-six million, six hundred thirty-four thousand, four hundred twenty-seven".