129069729850 has 48 divisors (see below), whose sum is σ = 254308723200. Its totient is φ = 48568538880.

The previous prime is 129069729839. The next prime is 129069729853. The reversal of 129069729850 is 58927960921.

It is not an unprimeable number, because it can be changed into a prime (129069729853) 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, 1869241 + ... + 1937059.

It is an arithmetic number, because the mean of its divisors is an integer number (5298098400).

Almost surely, 2^129069729850 is an apocalyptic number.

129069729850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129069729850 is a deficient number, since it is larger than the sum of its proper divisors (125238993350).

129069729850 is a wasteful number, since it uses less digits than its factorization.

129069729850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70087 (or 70082 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 129069729850 in words is "one hundred twenty-nine billion, sixty-nine million, seven hundred twenty-nine thousand, eight hundred fifty".