2551908540 has 24 divisors (see below), whose sum is σ = 7145344080. Its totient is φ = 680508928.

The previous prime is 2551908517. The next prime is 2551908599. The reversal of 2551908540 is 458091552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21265845 + ... + 21265964.

It is an arithmetic number, because the mean of its divisors is an integer number (297722670).

Almost surely, 2^2551908540 is an apocalyptic number.

2551908540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551908540 is an abundant number, since it is smaller than the sum of its proper divisors (4593435540).

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

2551908540 is a wasteful number, since it uses less digits than its factorization.

2551908540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42531821 (or 42531819 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 2551908540 is about 50516.4185191310. The cubic root of 2551908540 is about 1366.5379651425.

The spelling of 2551908540 in words is "two billion, five hundred fifty-one million, nine hundred eight thousand, five hundred forty".