261743305207 has 2 divisors, whose sum is σ = 261743305208. Its totient is φ = 261743305206.

The previous prime is 261743305181. The next prime is 261743305211. The reversal of 261743305207 is 702503347162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261743305207 - 2¹⁹ = 261742780919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261743305207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261743305507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130871652603 + 130871652604.

It is an arithmetic number, because the mean of its divisors is an integer number (130871652604).

Almost surely, 2^261743305207 is an apocalyptic number.

261743305207 is a deficient number, since it is larger than the sum of its proper divisors (1).

261743305207 is an equidigital number, since it uses as much as digits as its factorization.

261743305207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 261743305207 in words is "two hundred sixty-one billion, seven hundred forty-three million, three hundred five thousand, two hundred seven".