2561304667 has 2 divisors, whose sum is σ = 2561304668. Its totient is φ = 2561304666.

The previous prime is 2561304611. The next prime is 2561304703. The reversal of 2561304667 is 7664031652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561304667 - 2¹⁹ = 2560780379 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561304467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280652333 + 1280652334.

It is an arithmetic number, because the mean of its divisors is an integer number (1280652334).

Almost surely, 2^2561304667 is an apocalyptic number.

2561304667 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561304667 is an equidigital number, since it uses as much as digits as its factorization.

2561304667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2561304667 is about 50609.3337932836. Note that the first 3 decimals coincide. The cubic root of 2561304667 is about 1368.2131084148.

The spelling of 2561304667 in words is "two billion, five hundred sixty-one million, three hundred four thousand, six hundred sixty-seven".