129727169136434 has 16 divisors (see below), whose sum is σ = 206046665465400. Its totient is φ = 61045295345664.

The previous prime is 129727169136403. The next prime is 129727169136503. The reversal of 129727169136434 is 434631961727921.

It can be written as a sum of positive squares in 4 ways, for example, as 101364120600625 + 28363048535809 = 10067975^2 + 5325697^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86251199 + ... + 87742370.

Almost surely, 2^{129727169136434} is an apocalyptic number.

129727169136434 is a deficient number, since it is larger than the sum of its proper divisors (76319496328966).

129727169136434 is a wasteful number, since it uses less digits than its factorization.

129727169136434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174015517.

The product of its digits is 82301184, while the sum is 65.

The spelling of 129727169136434 in words is "one hundred twenty-nine trillion, seven hundred twenty-seven billion, one hundred sixty-nine million, one hundred thirty-six thousand, four hundred thirty-four".