129968676581 has 2 divisors, whose sum is σ = 129968676582. Its totient is φ = 129968676580.

The previous prime is 129968676569. The next prime is 129968676589. The reversal of 129968676581 is 185676869921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129750523681 + 218152900 = 360209^2 + 14770^2 .

It is an emirp because it is prime and its reverse (185676869921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129968676581 - 2³⁰ = 128894934757 is a prime.

It is a super-2 number, since 2×129968676581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129968676589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64984338290 + 64984338291.

It is an arithmetic number, because the mean of its divisors is an integer number (64984338291).

Almost surely, 2^129968676581 is an apocalyptic number.

It is an amenable number.

129968676581 is a deficient number, since it is larger than the sum of its proper divisors (1).

129968676581 is an equidigital number, since it uses as much as digits as its factorization.

129968676581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 68.

The spelling of 129968676581 in words is "one hundred twenty-nine billion, nine hundred sixty-eight million, six hundred seventy-six thousand, five hundred eighty-one".