129775123296 has 720 divisors, whose sum is σ = 487479628944. Its totient is φ = 33557981184.

The previous prime is 129775123271. The next prime is 129775123301. The reversal of 129775123296 is 692321577921.

129775123296 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 7 + 512 + 32 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 87507771 + ... + 87509253.

Almost surely, 2^129775123296 is an apocalyptic number.

129775123296 is a gapful number since it is divisible by the number (16) 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 129775123296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243739814472).

129775123296 is an abundant number, since it is smaller than the sum of its proper divisors (357704505648).

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

129775123296 is a wasteful number, since it uses less digits than its factorization.

129775123296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585 (or 1561 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The spelling of 129775123296 in words is "one hundred twenty-nine billion, seven hundred seventy-five million, one hundred twenty-three thousand, two hundred ninety-six".