2565121004 has 24 divisors (see below), whose sum is σ = 4573571856. Its totient is φ = 1258488000.

The previous prime is 2565121003. The next prime is 2565121019. The reversal of 2565121004 is 4001215652.

2565121004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2565121003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90239 + ... + 115209.

It is an arithmetic number, because the mean of its divisors is an integer number (190565494).

Almost surely, 2^2565121004 is an apocalyptic number.

It is an amenable number.

2565121004 is a deficient number, since it is larger than the sum of its proper divisors (2008450852).

2565121004 is a wasteful number, since it uses less digits than its factorization.

2565121004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25457 (or 25455 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2565121004 is about 50647.0236440405. The cubic root of 2565121004 is about 1368.8923157930.

Adding to 2565121004 its reverse (4001215652), we get a palindrome (6566336656).

The spelling of 2565121004 in words is "two billion, five hundred sixty-five million, one hundred twenty-one thousand, four".