2565189648 has 120 divisors (see below), whose sum is σ = 8508497088. Its totient is φ = 732903552.

The previous prime is 2565189647. The next prime is 2565189659. The reversal of 2565189648 is 8469815652.

2565189648 is a `hidden beast` number, since 2 + 565 + 18 + 9 + 64 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 2565189594 and 2565189603.

It is not an unprimeable number, because it can be changed into a prime (2565189647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19911 + ... + 74342.

Almost surely, 2^2565189648 is an apocalyptic number.

2565189648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2565189648 is an abundant number, since it is smaller than the sum of its proper divisors (5943307440).

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

2565189648 is an equidigital number, since it uses as much as digits as its factorization.

2565189648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94283 (or 94265 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 2565189648 is about 50647.7013101286. The cubic root of 2565189648 is about 1368.9045264458.

The spelling of 2565189648 in words is "two billion, five hundred sixty-five million, one hundred eighty-nine thousand, six hundred forty-eight".