268723564261 has 2 divisors, whose sum is σ = 268723564262. Its totient is φ = 268723564260.

The previous prime is 268723564199. The next prime is 268723564271. The reversal of 268723564261 is 162465327862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167849993025 + 100873571236 = 409695^2 + 317606^2 .

It is a cyclic number.

It is not a de Polignac number, because 268723564261 - 2⁹ = 268723563749 is a prime.

It is a super-2 number, since 2×268723564261² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 268723564199 and 268723564208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268723564271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134361782130 + 134361782131.

It is an arithmetic number, because the mean of its divisors is an integer number (134361782131).

Almost surely, 2^268723564261 is an apocalyptic number.

It is an amenable number.

268723564261 is a deficient number, since it is larger than the sum of its proper divisors (1).

268723564261 is an equidigital number, since it uses as much as digits as its factorization.

268723564261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 52.

The spelling of 268723564261 in words is "two hundred sixty-eight billion, seven hundred twenty-three million, five hundred sixty-four thousand, two hundred sixty-one".