2556781148 has 12 divisors (see below), whose sum is σ = 4482641352. Its totient is φ = 1276026480.

The previous prime is 2556781121. The next prime is 2556781169. The reversal of 2556781148 is 8411876552.

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, 588590 + ... + 592917.

It is an arithmetic number, because the mean of its divisors is an integer number (373553446).

Almost surely, 2^2556781148 is an apocalyptic number.

It is an amenable number.

2556781148 is a deficient number, since it is larger than the sum of its proper divisors (1925860204).

2556781148 is a wasteful number, since it uses less digits than its factorization.

2556781148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182052 (or 1182050 counting only the distinct ones).

The product of its digits is 537600, while the sum is 47.

The square root of 2556781148 is about 50564.6234832219. The cubic root of 2556781148 is about 1367.4071669227.

The spelling of 2556781148 in words is "two billion, five hundred fifty-six million, seven hundred eighty-one thousand, one hundred forty-eight".