261436873273 has 2 divisors, whose sum is σ = 261436873274. Its totient is φ = 261436873272.

The previous prime is 261436873267. The next prime is 261436873283. The reversal of 261436873273 is 372378634162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215103019264 + 46333854009 = 463792^2 + 215253^2 .

It is a cyclic number.

It is not a de Polignac number, because 261436873273 - 2²⁹ = 260900002361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261436873273.

It is not a weakly prime, because it can be changed into another prime (261436873283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130718436636 + 130718436637.

It is an arithmetic number, because the mean of its divisors is an integer number (130718436637).

Almost surely, 2^261436873273 is an apocalyptic number.

It is an amenable number.

261436873273 is a deficient number, since it is larger than the sum of its proper divisors (1).

261436873273 is an equidigital number, since it uses as much as digits as its factorization.

261436873273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 52.

The spelling of 261436873273 in words is "two hundred sixty-one billion, four hundred thirty-six million, eight hundred seventy-three thousand, two hundred seventy-three".