261728935667 has 2 divisors, whose sum is σ = 261728935668. Its totient is φ = 261728935666.

The previous prime is 261728935609. The next prime is 261728935691. The reversal of 261728935667 is 766539827162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261728935667 is a prime.

It is not a weakly prime, because it can be changed into another prime (261728935607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130864467833 + 130864467834.

It is an arithmetic number, because the mean of its divisors is an integer number (130864467834).

Almost surely, 2^261728935667 is an apocalyptic number.

261728935667 is a deficient number, since it is larger than the sum of its proper divisors (1).

261728935667 is an equidigital number, since it uses as much as digits as its factorization.

261728935667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 62.

The spelling of 261728935667 in words is "two hundred sixty-one billion, seven hundred twenty-eight million, nine hundred thirty-five thousand, six hundred sixty-seven".