2556815800000 has 336 divisors, whose sum is σ = 7906577446656. Its totient is φ = 796924800000.

The previous prime is 2556815799971. The next prime is 2556815800061. The reversal of 2556815800000 is 85186552.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15316987 + ... + 15483013.

It is an arithmetic number, because the mean of its divisors is an integer number (23531480496).

Almost surely, 2^{2556815800000} is an apocalyptic number.

2556815800000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556815800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3953288723328).

2556815800000 is an abundant number, since it is smaller than the sum of its proper divisors (5349761646656).

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

2556815800000 is an equidigital number, since it uses as much as digits as its factorization.

2556815800000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166082 (or 166052 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The spelling of 2556815800000 in words is "two trillion, five hundred fifty-six billion, eight hundred fifteen million, eight hundred thousand".