2555666040 has 64 divisors (see below), whose sum is σ = 7914332160. Its totient is φ = 659525760.

The previous prime is 2555666039. The next prime is 2555666063. The reversal of 2555666040 is 406665552.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2555666040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339784 + ... + 347223.

It is an arithmetic number, because the mean of its divisors is an integer number (123661440).

Almost surely, 2^2555666040 is an apocalyptic number.

2555666040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2555666040 is an abundant number, since it is smaller than the sum of its proper divisors (5358666120).

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

2555666040 is a wasteful number, since it uses less digits than its factorization.

2555666040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687052 (or 687048 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 2555666040 is about 50553.5957178122. The cubic root of 2555666040 is about 1367.2083455255.

The spelling of 2555666040 in words is "two billion, five hundred fifty-five million, six hundred sixty-six thousand, forty".