129557058772 has 24 divisors (see below), whose sum is σ = 230188280616. Its totient is φ = 63796282368.

The previous prime is 129557058739. The next prime is 129557058779. The reversal of 129557058772 is 277850755921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1596322116 + 127960736656 = 39954^2 + 357716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129557058779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 841873 + ... + 983800.

It is an arithmetic number, because the mean of its divisors is an integer number (9591178359).

Almost surely, 2^129557058772 is an apocalyptic number.

It is an amenable number.

129557058772 is a deficient number, since it is larger than the sum of its proper divisors (100631221844).

129557058772 is a wasteful number, since it uses less digits than its factorization.

129557058772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825947 (or 1825945 counting only the distinct ones).

The product of its (nonzero) digits is 12348000, while the sum is 58.

The spelling of 129557058772 in words is "one hundred twenty-nine billion, five hundred fifty-seven million, fifty-eight thousand, seven hundred seventy-two".