129136656203 has 4 divisors (see below), whose sum is σ = 129184790328. Its totient is φ = 129088522080.

The previous prime is 129136656169. The next prime is 129136656217. The reversal of 129136656203 is 302656631921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129136656203 - 2¹² = 129136652107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129136656293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24063038 + ... + 24068403.

It is an arithmetic number, because the mean of its divisors is an integer number (32296197582).

Almost surely, 2^129136656203 is an apocalyptic number.

129136656203 is a deficient number, since it is larger than the sum of its proper divisors (48134125).

129136656203 is an equidigital number, since it uses as much as digits as its factorization.

129136656203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48134124.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 129136656203 in words is "one hundred twenty-nine billion, one hundred thirty-six million, six hundred fifty-six thousand, two hundred three".