2565061820 has 24 divisors (see below), whose sum is σ = 5422788000. Its totient is φ = 1019137472.

The previous prime is 2565061781. The next prime is 2565061841. The reversal of 2565061820 is 281605652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427400 + ... + 433359.

It is an arithmetic number, because the mean of its divisors is an integer number (225949500).

Almost surely, 2^2565061820 is an apocalyptic number.

2565061820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2565061820 is an abundant number, since it is smaller than the sum of its proper divisors (2857726180).

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

2565061820 is a wasteful number, since it uses less digits than its factorization.

2565061820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860917 (or 860915 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 2565061820 is about 50646.4393615188. The cubic root of 2565061820 is about 1368.8817877457.

The spelling of 2565061820 in words is "two billion, five hundred sixty-five million, sixty-one thousand, eight hundred twenty".