1255305663 has 24 divisors (see below), whose sum is σ = 1824352400. Its totient is φ = 831752064.

The previous prime is 1255305581. The next prime is 1255305677. The reversal of 1255305663 is 3665035521.

1255305663 is a `hidden beast` number, since 12 + 5 + 530 + 56 + 63 = 666.

It is not a de Polignac number, because 1255305663 - 2¹⁰ = 1255304639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255305263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1460928 + ... + 1461786.

Almost surely, 2^1255305663 is an apocalyptic number.

1255305663 is a deficient number, since it is larger than the sum of its proper divisors (569046737).

1255305663 is a wasteful number, since it uses less digits than its factorization.

1255305663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 1255305663 is about 35430.2930131829. The cubic root of 1255305663 is about 1078.7392876549.

The spelling of 1255305663 in words is "one billion, two hundred fifty-five million, three hundred five thousand, six hundred sixty-three".