2566785648 has 160 divisors (see below), whose sum is σ = 8101481472. Its totient is φ = 684288000.

The previous prime is 2566785623. The next prime is 2566785649. The reversal of 2566785648 is 8465876652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566785649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312798 + ... + 320898.

Almost surely, 2^2566785648 is an apocalyptic number.

2566785648 is a gapful number since it is divisible by the number (28) 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 2566785648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4050740736).

2566785648 is an abundant number, since it is smaller than the sum of its proper divisors (5534695824).

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

2566785648 is a wasteful number, since it uses less digits than its factorization.

2566785648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8183 (or 8177 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 57.

The square root of 2566785648 is about 50663.4547578430. The cubic root of 2566785648 is about 1369.1883675357.

The spelling of 2566785648 in words is "two billion, five hundred sixty-six million, seven hundred eighty-five thousand, six hundred forty-eight".