1255638568 has 8 divisors (see below), whose sum is σ = 2354322330. Its totient is φ = 627819280.

The previous prime is 1255638557. The next prime is 1255638577. The reversal of 1255638568 is 8658365521.

It can be written as a sum of positive squares in only one way, i.e., 1145010244 + 110628324 = 33838^2 + 10518^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78477403 + ... + 78477418.

Almost surely, 2^1255638568 is an apocalyptic number.

It is an amenable number.

1255638568 is a deficient number, since it is larger than the sum of its proper divisors (1098683762).

1255638568 is a wasteful number, since it uses less digits than its factorization.

1255638568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156954827 (or 156954823 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 49.

The square root of 1255638568 is about 35434.9907295035. The cubic root of 1255638568 is about 1078.8346391888.

The spelling of 1255638568 in words is "one billion, two hundred fifty-five million, six hundred thirty-eight thousand, five hundred sixty-eight".