129855638563 has 8 divisors (see below), whose sum is σ = 148942209632. Its totient is φ = 110903008896.

The previous prime is 129855638543. The next prime is 129855638581. The reversal of 129855638563 is 365836558921.

It is a happy number.

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 129855638563 - 2⁹ = 129855638051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129855638543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33483270 + ... + 33487147.

It is an arithmetic number, because the mean of its divisors is an integer number (18617776204).

Almost surely, 2^129855638563 is an apocalyptic number.

129855638563 is a deficient number, since it is larger than the sum of its proper divisors (19086571069).

129855638563 is an equidigital number, since it uses as much as digits as its factorization.

129855638563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66970701.

The product of its digits is 46656000, while the sum is 61.

The spelling of 129855638563 in words is "one hundred twenty-nine billion, eight hundred fifty-five million, six hundred thirty-eight thousand, five hundred sixty-three".