129568500073 has 4 divisors (see below), whose sum is σ = 129778498260. Its totient is φ = 129358501888.

The previous prime is 129568500037. The next prime is 129568500091. The reversal of 129568500073 is 370005865921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370005865921 = 2861 ⋅129327461.

It can be written as a sum of positive squares in 2 ways, for example, as 51787194624 + 77781305449 = 227568^2 + 278893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129568500073 is a prime.

It is a super-2 number, since 2×129568500073² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129568499996 and 129568500032.

It is not an unprimeable number, because it can be changed into a prime (129568506073) 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 3 ways as a sum of consecutive naturals, for example, 104998168 + ... + 104999401.

It is an arithmetic number, because the mean of its divisors is an integer number (32444624565).

Almost surely, 2^129568500073 is an apocalyptic number.

It is an amenable number.

129568500073 is a deficient number, since it is larger than the sum of its proper divisors (209998187).

129568500073 is an equidigital number, since it uses as much as digits as its factorization.

129568500073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209998186.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 129568500073 in words is "one hundred twenty-nine billion, five hundred sixty-eight million, five hundred thousand, seventy-three".