255663555643 has 2 divisors, whose sum is σ = 255663555644. Its totient is φ = 255663555642.

The previous prime is 255663555617. The next prime is 255663555659. The reversal of 255663555643 is 346555366552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255663555643 is a prime.

It is not a weakly prime, because it can be changed into another prime (255663555613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127831777821 + 127831777822.

It is an arithmetic number, because the mean of its divisors is an integer number (127831777822).

Almost surely, 2^255663555643 is an apocalyptic number.

255663555643 is a deficient number, since it is larger than the sum of its proper divisors (1).

255663555643 is an equidigital number, since it uses as much as digits as its factorization.

255663555643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600000, while the sum is 55.

The spelling of 255663555643 in words is "two hundred fifty-five billion, six hundred sixty-three million, five hundred fifty-five thousand, six hundred forty-three".