2556542320 has 20 divisors (see below), whose sum is σ = 5943961080. Its totient is φ = 1022616896.

The previous prime is 2556542293. The next prime is 2556542347. The reversal of 2556542320 is 232456552.

It is an interprime number because it is at equal distance from previous prime (2556542293) and next prime (2556542347).

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15978310 + ... + 15978469.

It is an arithmetic number, because the mean of its divisors is an integer number (297198054).

Almost surely, 2^2556542320 is an apocalyptic number.

2556542320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2556542320 is an abundant number, since it is smaller than the sum of its proper divisors (3387418760).

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

2556542320 is a wasteful number, since it uses less digits than its factorization.

2556542320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31956792 (or 31956786 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 2556542320 is about 50562.2618164971. The cubic root of 2556542320 is about 1367.3645892610.

Adding to 2556542320 its reverse (232456552), we get a palindrome (2788998872).

The spelling of 2556542320 in words is "two billion, five hundred fifty-six million, five hundred forty-two thousand, three hundred twenty".