129166056251 has 2 divisors, whose sum is σ = 129166056252. Its totient is φ = 129166056250.

The previous prime is 129166056233. The next prime is 129166056307. The reversal of 129166056251 is 152650661921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129166056251 - 2³⁴ = 111986187067 is a prime.

It is not a weakly prime, because it can be changed into another prime (129166056211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64583028125 + 64583028126.

It is an arithmetic number, because the mean of its divisors is an integer number (64583028126).

Almost surely, 2^129166056251 is an apocalyptic number.

129166056251 is a deficient number, since it is larger than the sum of its proper divisors (1).

129166056251 is an equidigital number, since it uses as much as digits as its factorization.

129166056251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 129166056251 in words is "one hundred twenty-nine billion, one hundred sixty-six million, fifty-six thousand, two hundred fifty-one".