129112807669 has 2 divisors, whose sum is σ = 129112807670. Its totient is φ = 129112807668.

The previous prime is 129112807609. The next prime is 129112807693. The reversal of 129112807669 is 966708211921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105423596100 + 23689211569 = 324690^2 + 153913^2 .

It is a cyclic number.

It is not a de Polignac number, because 129112807669 - 2¹⁹ = 129112283381 is a prime.

It is a super-2 number, since 2×129112807669² (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 (129112807609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64556403834 + 64556403835.

It is an arithmetic number, because the mean of its divisors is an integer number (64556403835).

Almost surely, 2^129112807669 is an apocalyptic number.

It is an amenable number.

129112807669 is a deficient number, since it is larger than the sum of its proper divisors (1).

129112807669 is an equidigital number, since it uses as much as digits as its factorization.

129112807669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 129112807669 in words is "one hundred twenty-nine billion, one hundred twelve million, eight hundred seven thousand, six hundred sixty-nine".