129026601956 has 24 divisors (see below), whose sum is σ = 262283587776. Its totient is φ = 54390604320.

The previous prime is 129026601929. The next prime is 129026601971. The reversal of 129026601956 is 659106620921.

It is a self number, because there is not a number n which added to its sum of digits gives 129026601956.

It is an unprimeable number.

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, 37769546 + ... + 37772961.

It is an arithmetic number, because the mean of its divisors is an integer number (10928482824).

Almost surely, 2^129026601956 is an apocalyptic number.

It is an amenable number.

129026601956 is an abundant number, since it is smaller than the sum of its proper divisors (133256985820).

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

129026601956 is a wasteful number, since it uses less digits than its factorization.

129026601956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75542579 (or 75542577 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 129026601956 in words is "one hundred twenty-nine billion, twenty-six million, six hundred one thousand, nine hundred fifty-six".