129551496156 has 144 divisors (see below), whose sum is σ = 350651325024. Its totient is φ = 40264293888.

The previous prime is 129551496127. The next prime is 129551496157. The reversal of 129551496156 is 651694155921.

129551496156 is a `hidden beast` number, since 1 + 2 + 9 + 5 + 5 + 14 + 9 + 615 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129551496157) 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, 3014290 + ... + 3056966.

It is an arithmetic number, because the mean of its divisors is an integer number (2435078646).

Almost surely, 2^129551496156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129551496156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175325662512).

129551496156 is an abundant number, since it is smaller than the sum of its proper divisors (221099828868).

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

129551496156 is a wasteful number, since it uses less digits than its factorization.

129551496156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42820 (or 42815 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 129551496156 in words is "one hundred twenty-nine billion, five hundred fifty-one million, four hundred ninety-six thousand, one hundred fifty-six".