2565220540 has 12 divisors (see below), whose sum is σ = 5386963176. Its totient is φ = 1026088208.

The previous prime is 2565220531. The next prime is 2565220543. The reversal of 2565220540 is 450225652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565220543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64130494 + ... + 64130533.

It is an arithmetic number, because the mean of its divisors is an integer number (448913598).

Almost surely, 2^2565220540 is an apocalyptic number.

2565220540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2565220540 is an abundant number, since it is smaller than the sum of its proper divisors (2821742636).

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

2565220540 is a wasteful number, since it uses less digits than its factorization.

2565220540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128261036 (or 128261034 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 2565220540 is about 50648.0062786286. The cubic root of 2565220540 is about 1368.9100215599.

The spelling of 2565220540 in words is "two billion, five hundred sixty-five million, two hundred twenty thousand, five hundred forty".