261266178307 has 2 divisors, whose sum is σ = 261266178308. Its totient is φ = 261266178306.

The previous prime is 261266178289. The next prime is 261266178317. The reversal of 261266178307 is 703871662162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261266178307 - 2⁷ = 261266178179 is a prime.

It is not a weakly prime, because it can be changed into another prime (261266178317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130633089153 + 130633089154.

It is an arithmetic number, because the mean of its divisors is an integer number (130633089154).

Almost surely, 2^261266178307 is an apocalyptic number.

261266178307 is a deficient number, since it is larger than the sum of its proper divisors (1).

261266178307 is an equidigital number, since it uses as much as digits as its factorization.

261266178307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 261266178307 in words is "two hundred sixty-one billion, two hundred sixty-six million, one hundred seventy-eight thousand, three hundred seven".