261302266909 has 2 divisors, whose sum is σ = 261302266910. Its totient is φ = 261302266908.

The previous prime is 261302266801. The next prime is 261302266931. The reversal of 261302266909 is 909662203162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251291664100 + 10010602809 = 501290^2 + 100053^2 .

It is a cyclic number.

It is not a de Polignac number, because 261302266909 - 2³³ = 252712332317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261302266999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130651133454 + 130651133455.

It is an arithmetic number, because the mean of its divisors is an integer number (130651133455).

Almost surely, 2^261302266909 is an apocalyptic number.

It is an amenable number.

261302266909 is a deficient number, since it is larger than the sum of its proper divisors (1).

261302266909 is an equidigital number, since it uses as much as digits as its factorization.

261302266909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 46.

The spelling of 261302266909 in words is "two hundred sixty-one billion, three hundred two million, two hundred sixty-six thousand, nine hundred nine".