255555647 has 2 divisors, whose sum is σ = 255555648. Its totient is φ = 255555646.

The previous prime is 255555533. The next prime is 255555653. The reversal of 255555647 is 746555552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255555647 - 2¹⁰ = 255554623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255555598 and 255555607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255555667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127777823 + 127777824.

It is an arithmetic number, because the mean of its divisors is an integer number (127777824).

Almost surely, 2^255555647 is an apocalyptic number.

255555647 is a deficient number, since it is larger than the sum of its proper divisors (1).

255555647 is an equidigital number, since it uses as much as digits as its factorization.

255555647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050000, while the sum is 44.

The square root of 255555647 is about 15986.1079378315. The cubic root of 255555647 is about 634.5928296790.

The spelling of 255555647 in words is "two hundred fifty-five million, five hundred fifty-five thousand, six hundred forty-seven".