129805606081 has 2 divisors, whose sum is σ = 129805606082. Its totient is φ = 129805606080.

The previous prime is 129805606067. The next prime is 129805606097. The reversal of 129805606081 is 180606508921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89511065856 + 40294540225 = 299184^2 + 200735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129805606081 is a prime.

It is a super-2 number, since 2×129805606081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129805606481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64902803040 + 64902803041.

It is an arithmetic number, because the mean of its divisors is an integer number (64902803041).

Almost surely, 2^129805606081 is an apocalyptic number.

It is an amenable number.

129805606081 is a deficient number, since it is larger than the sum of its proper divisors (1).

129805606081 is an equidigital number, since it uses as much as digits as its factorization.

129805606081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 129805606081 in words is "one hundred twenty-nine billion, eight hundred five million, six hundred six thousand, eighty-one".