1255331646 has 48 divisors (see below), whose sum is σ = 2916388800. Its totient is φ = 388836864.

The previous prime is 1255331641. The next prime is 1255331669. The reversal of 1255331646 is 6461335521.

1255331646 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 3 + 3 + 1 + 646 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1255331646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255331641) 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, 1791 + ... + 50138.

It is an arithmetic number, because the mean of its divisors is an integer number (60758100).

Almost surely, 2^1255331646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255331646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1458194400).

1255331646 is an abundant number, since it is smaller than the sum of its proper divisors (1661057154).

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

1255331646 is a wasteful number, since it uses less digits than its factorization.

1255331646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52033 (or 52030 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1255331646 is about 35430.6596890320. The cubic root of 1255331646 is about 1078.7467303812.

The spelling of 1255331646 in words is "one billion, two hundred fifty-five million, three hundred thirty-one thousand, six hundred forty-six".