260639999 has 2 divisors, whose sum is σ = 260640000. Its totient is φ = 260639998.

The previous prime is 260639989. The next prime is 260640001. The reversal of 260639999 is 999936062.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 260639999 - 2¹⁶ = 260574463 is a prime.

Together with 260640001, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260639999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260639959) 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, 130319999 + 130320000.

It is an arithmetic number, because the mean of its divisors is an integer number (130320000).

Almost surely, 2^260639999 is an apocalyptic number.

260639999 is a deficient number, since it is larger than the sum of its proper divisors (1).

260639999 is an equidigital number, since it uses as much as digits as its factorization.

260639999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 53.

The square root of 260639999 is about 16144.3488255179. The cubic root of 260639999 is about 638.7736926196.

The spelling of 260639999 in words is "two hundred sixty million, six hundred thirty-nine thousand, nine hundred ninety-nine".