129242162500 has 144 divisors (see below), whose sum is σ = 313024340160. Its totient is φ = 46292400000.

The previous prime is 129242162473. The next prime is 129242162509. The reversal of 129242162500 is 5261242921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (129242162509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9205486 + ... + 9219514.

It is an arithmetic number, because the mean of its divisors is an integer number (2173780140).

Almost surely, 2^129242162500 is an apocalyptic number.

129242162500 is a gapful number since it is divisible by the number (10) 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 129242162500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156512170080).

129242162500 is an abundant number, since it is smaller than the sum of its proper divisors (183782177660).

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

129242162500 is a wasteful number, since it uses less digits than its factorization.

129242162500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14136 (or 14114 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 129242162500 in words is "one hundred twenty-nine billion, two hundred forty-two million, one hundred sixty-two thousand, five hundred".