261318755947 has 2 divisors, whose sum is σ = 261318755948. Its totient is φ = 261318755946.

The previous prime is 261318755941. The next prime is 261318756007. The reversal of 261318755947 is 749557813162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261318755947 - 2¹⁵ = 261318723179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261318755891 and 261318755900.

It is not a weakly prime, because it can be changed into another prime (261318755941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130659377973 + 130659377974.

It is an arithmetic number, because the mean of its divisors is an integer number (130659377974).

Almost surely, 2^261318755947 is an apocalyptic number.

261318755947 is a deficient number, since it is larger than the sum of its proper divisors (1).

261318755947 is an equidigital number, since it uses as much as digits as its factorization.

261318755947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 58.

The spelling of 261318755947 in words is "two hundred sixty-one billion, three hundred eighteen million, seven hundred fifty-five thousand, nine hundred forty-seven".