129161520255626 has 16 divisors (see below), whose sum is σ = 193879938155400. Its totient is φ = 64534879618560.

The previous prime is 129161520255613. The next prime is 129161520255641. The reversal of 129161520255626 is 626552025161921.

It is a Cunningham number, because it is equal to 11364925²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 129161520255625 + 1 = 11364925^2 + 1^2 .

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, 46664546 + ... + 49354866.

Almost surely, 2^{129161520255626} is an apocalyptic number.

129161520255626 is a deficient number, since it is larger than the sum of its proper divisors (64718417899774).

129161520255626 is a wasteful number, since it uses less digits than its factorization.

129161520255626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707369.

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 129161520255626 in words is "one hundred twenty-nine trillion, one hundred sixty-one billion, five hundred twenty million, two hundred fifty-five thousand, six hundred twenty-six".