129005256605 has 8 divisors (see below), whose sum is σ = 154824156000. Its totient is φ = 103192306576.

The previous prime is 129005256563. The next prime is 129005256643. The reversal of 129005256605 is 506652500921.

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

It is a cyclic number.

It is not a de Polignac number, because 129005256605 - 2²² = 129001062301 is a prime.

It is a super-2 number, since 2×129005256605² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1439495 + ... + 1526484.

It is an arithmetic number, because the mean of its divisors is an integer number (19353019500).

Almost surely, 2^129005256605 is an apocalyptic number.

It is an amenable number.

129005256605 is a deficient number, since it is larger than the sum of its proper divisors (25818899395).

129005256605 is an equidigital number, since it uses as much as digits as its factorization.

129005256605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974683.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 129005256605 in words is "one hundred twenty-nine billion, five million, two hundred fifty-six thousand, six hundred five".