261298858273 has 2 divisors, whose sum is σ = 261298858274. Its totient is φ = 261298858272.

The previous prime is 261298858199. The next prime is 261298858339. The reversal of 261298858273 is 372858892162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153325498624 + 107973359649 = 391568^2 + 328593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261298858273 is a prime.

It is not a weakly prime, because it can be changed into another prime (261298858673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130649429136 + 130649429137.

It is an arithmetic number, because the mean of its divisors is an integer number (130649429137).

Almost surely, 2^261298858273 is an apocalyptic number.

It is an amenable number.

261298858273 is a deficient number, since it is larger than the sum of its proper divisors (1).

261298858273 is an equidigital number, since it uses as much as digits as its factorization.

261298858273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23224320, while the sum is 61.

The spelling of 261298858273 in words is "two hundred sixty-one billion, two hundred ninety-eight million, eight hundred fifty-eight thousand, two hundred seventy-three".