25801011 has 24 divisors (see below), whose sum is σ = 39115440. Its totient is φ = 16993152.

The previous prime is 25800997. The next prime is 25801049. The reversal of 25801011 is 11010852.

It is not a de Polignac number, because 25801011 - 2¹⁰ = 25799987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25801051) 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, 21031 + ... + 22223.

It is an arithmetic number, because the mean of its divisors is an integer number (1629810).

Almost surely, 2^25801011 is an apocalyptic number.

25801011 is a deficient number, since it is larger than the sum of its proper divisors (13314429).

25801011 is an equidigital number, since it uses as much as digits as its factorization.

25801011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 25801011 is about 5079.4695589205. The cubic root of 25801011 is about 295.4918959874.

Adding to 25801011 its reverse (11010852), we get a palindrome (36811863).

The spelling of 25801011 in words is "twenty-five million, eight hundred one thousand, eleven".