129232229618 has 6 divisors (see below), whose sum is σ = 193849107021. Its totient is φ = 64615860612.

The previous prime is 129232229617. The next prime is 129232229689. The reversal of 129232229618 is 816922232921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66428361169 + 62803868449 = 257737^2 + 250607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=254197.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129232229617) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 381296 + ... + 635492.

Almost surely, 2^129232229618 is an apocalyptic number.

129232229618 is a deficient number, since it is larger than the sum of its proper divisors (64616877403).

129232229618 is an frugal number, since it uses more digits than its factorization.

129232229618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508396 (or 254199 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The spelling of 129232229618 in words is "one hundred twenty-nine billion, two hundred thirty-two million, two hundred twenty-nine thousand, six hundred eighteen".