1255605642 has 24 divisors (see below), whose sum is σ = 2727487620. Its totient is φ = 417456960.

The previous prime is 1255605613. The next prime is 1255605643. The reversal of 1255605642 is 2465065521.

1255605642 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 6 + 0 + 5 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1247431761 + 8173881 = 35319^2 + 2859^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1255605597 and 1255605606.

It is not an unprimeable number, because it can be changed into a prime (1255605643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82659 + ... + 96662.

Almost surely, 2^1255605642 is an apocalyptic number.

1255605642 is an abundant number, since it is smaller than the sum of its proper divisors (1471881978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255605642 is a wasteful number, since it uses less digits than its factorization.

1255605642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179718 (or 179715 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1255605642 is about 35434.5261291865. The cubic root of 1255605642 is about 1078.8252091875.

The spelling of 1255605642 in words is "one billion, two hundred fifty-five million, six hundred five thousand, six hundred forty-two".