129198673872 has 120 divisors (see below), whose sum is σ = 372144127680. Its totient is φ = 41825710080.

The previous prime is 129198673861. The next prime is 129198673873. The reversal of 129198673872 is 278376891921.

129198673872 is a `hidden beast` number, since 1 + 2 + 9 + 198 + 67 + 387 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129198673873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 590704 + ... + 779312.

It is an arithmetic number, because the mean of its divisors is an integer number (3101201064).

Almost surely, 2^129198673872 is an apocalyptic number.

129198673872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129198673872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186072063840).

129198673872 is an abundant number, since it is smaller than the sum of its proper divisors (242945453808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129198673872 is a wasteful number, since it uses less digits than its factorization.

129198673872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188761 (or 188752 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 129198673872 in words is "one hundred twenty-nine billion, one hundred ninety-eight million, six hundred seventy-three thousand, eight hundred seventy-two".