261432072061117 has 2 divisors, whose sum is σ = 261432072061118. Its totient is φ = 261432072061116.

The previous prime is 261432072061093. The next prime is 261432072061169. The reversal of 261432072061117 is 711160270234162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192020162693956 + 69411909367161 = 13857134^2 + 8331381^2 .

It is a cyclic number.

It is not a de Polignac number, because 261432072061117 - 2²⁷ = 261431937843389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261432072061417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130716036030558 + 130716036030559.

It is an arithmetic number, because the mean of its divisors is an integer number (130716036030559).

Almost surely, 2^{261432072061117} is an apocalyptic number.

It is an amenable number.

261432072061117 is a deficient number, since it is larger than the sum of its proper divisors (1).

261432072061117 is an equidigital number, since it uses as much as digits as its factorization.

261432072061117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 261432072061117 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, seventy-two million, sixty-one thousand, one hundred seventeen".