261049923359 has 2 divisors, whose sum is σ = 261049923360. Its totient is φ = 261049923358.

The previous prime is 261049923349. The next prime is 261049923389. The reversal of 261049923359 is 953329940162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261049923359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261049923359.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261049923349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130524961679 + 130524961680.

It is an arithmetic number, because the mean of its divisors is an integer number (130524961680).

Almost surely, 2^261049923359 is an apocalyptic number.

261049923359 is a deficient number, since it is larger than the sum of its proper divisors (1).

261049923359 is an equidigital number, since it uses as much as digits as its factorization.

261049923359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The spelling of 261049923359 in words is "two hundred sixty-one billion, forty-nine million, nine hundred twenty-three thousand, three hundred fifty-nine".