2556743616 has 140 divisors (see below), whose sum is σ = 8661824688. Its totient is φ = 730487808.

The previous prime is 2556743599. The next prime is 2556743633. The reversal of 2556743616 is 6163476552.

2556743616 is a `hidden beast` number, since 25 + 5 + 6 + 7 + 4 + 3 + 616 = 666.

It is an interprime number because it is at equal distance from previous prime (2556743599) and next prime (2556743633).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1060 + ... + 71516.

Almost surely, 2^2556743616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556743616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4330912344).

2556743616 is an abundant number, since it is smaller than the sum of its proper divisors (6105081072).

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

2556743616 is an equidigital number, since it uses as much as digits as its factorization.

2556743616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70488 (or 70469 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 2556743616 is about 50564.2523528233. The cubic root of 2556743616 is about 1367.4004759867.

The spelling of 2556743616 in words is "two billion, five hundred fifty-six million, seven hundred forty-three thousand, six hundred sixteen".