261710561069 has 2 divisors, whose sum is σ = 261710561070. Its totient is φ = 261710561068.

The previous prime is 261710561029. The next prime is 261710561251. The reversal of 261710561069 is 960165017162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160356198025 + 101354363044 = 400445^2 + 318362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261710561069 is a prime.

It is a super-2 number, since 2×261710561069² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261710561009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130855280534 + 130855280535.

It is an arithmetic number, because the mean of its divisors is an integer number (130855280535).

Almost surely, 2^261710561069 is an apocalyptic number.

It is an amenable number.

261710561069 is a deficient number, since it is larger than the sum of its proper divisors (1).

261710561069 is an equidigital number, since it uses as much as digits as its factorization.

261710561069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 261710561069 in words is "two hundred sixty-one billion, seven hundred ten million, five hundred sixty-one thousand, sixty-nine".