261177056317 has 2 divisors, whose sum is σ = 261177056318. Its totient is φ = 261177056316.

The previous prime is 261177056303. The next prime is 261177056341. The reversal of 261177056317 is 713650771162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222532966756 + 38644089561 = 471734^2 + 196581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261177056317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261177006317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130588528158 + 130588528159.

It is an arithmetic number, because the mean of its divisors is an integer number (130588528159).

Almost surely, 2^261177056317 is an apocalyptic number.

It is an amenable number.

261177056317 is a deficient number, since it is larger than the sum of its proper divisors (1).

261177056317 is an equidigital number, since it uses as much as digits as its factorization.

261177056317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 261177056317 in words is "two hundred sixty-one billion, one hundred seventy-seven million, fifty-six thousand, three hundred seventeen".