129549540880 has 80 divisors (see below), whose sum is σ = 307005064704. Its totient is φ = 50822320640.

The previous prime is 129549540877. The next prime is 129549540881. The reversal of 129549540880 is 88045945921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129549540881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15968025 + ... + 15976135.

Almost surely, 2^129549540880 is an apocalyptic number.

129549540880 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 129549540880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153502532352).

129549540880 is an abundant number, since it is smaller than the sum of its proper divisors (177455523824).

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

129549540880 is a wasteful number, since it uses less digits than its factorization.

129549540880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11944 (or 11938 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 129549540880 in words is "one hundred twenty-nine billion, five hundred forty-nine million, five hundred forty thousand, eight hundred eighty".