129649537872 has 160 divisors (see below), whose sum is σ = 393784320000. Its totient is φ = 40727111040.

The previous prime is 129649537847. The next prime is 129649537877. The reversal of 129649537872 is 278735946921.

129649537872 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 495 + 3 + 78 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129649537877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1526379 + ... + 1609077.

It is an arithmetic number, because the mean of its divisors is an integer number (2461152000).

Almost surely, 2^129649537872 is an apocalyptic number.

129649537872 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 129649537872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196892160000).

129649537872 is an abundant number, since it is smaller than the sum of its proper divisors (264134782128).

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

129649537872 is a wasteful number, since it uses less digits than its factorization.

129649537872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82926 (or 82914 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 129649537872 in words is "one hundred twenty-nine billion, six hundred forty-nine million, five hundred thirty-seven thousand, eight hundred seventy-two".