129018870577 has 2 divisors, whose sum is σ = 129018870578. Its totient is φ = 129018870576.

The previous prime is 129018870551. The next prime is 129018870623. The reversal of 129018870577 is 775078810921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77304017296 + 51714853281 = 278036^2 + 227409^2 .

It is a cyclic number.

It is not a de Polignac number, because 129018870577 - 2²⁷ = 128884652849 is a prime.

It is not a weakly prime, because it can be changed into another prime (129018870517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64509435288 + 64509435289.

It is an arithmetic number, because the mean of its divisors is an integer number (64509435289).

Almost surely, 2^129018870577 is an apocalyptic number.

It is an amenable number.

129018870577 is a deficient number, since it is larger than the sum of its proper divisors (1).

129018870577 is an equidigital number, since it uses as much as digits as its factorization.

129018870577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 129018870577 in words is "one hundred twenty-nine billion, eighteen million, eight hundred seventy thousand, five hundred seventy-seven".