261362055961 has 2 divisors, whose sum is σ = 261362055962. Its totient is φ = 261362055960.

The previous prime is 261362055937. The next prime is 261362056027. The reversal of 261362055961 is 169550263162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208808785936 + 52553270025 = 456956^2 + 229245^2 .

It is a cyclic number.

It is not a de Polignac number, because 261362055961 - 2⁷ = 261362055833 is a prime.

It is not a weakly prime, because it can be changed into another prime (261362053961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130681027980 + 130681027981.

It is an arithmetic number, because the mean of its divisors is an integer number (130681027981).

Almost surely, 2^261362055961 is an apocalyptic number.

It is an amenable number.

261362055961 is a deficient number, since it is larger than the sum of its proper divisors (1).

261362055961 is an equidigital number, since it uses as much as digits as its factorization.

261362055961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 261362055961 in words is "two hundred sixty-one billion, three hundred sixty-two million, fifty-five thousand, nine hundred sixty-one".