25806004002 has 120 divisors (see below), whose sum is σ = 62356523328. Its totient is φ = 7961477040.

The previous prime is 25806004001. The next prime is 25806004031. The reversal of 25806004002 is 20040060852.

25806004002 is a `hidden beast` number, since 2 + 58 + 0 + 600 + 4 + 0 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25806004001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3577083 + ... + 3584289.

Almost surely, 2^25806004002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25806004002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31178261664).

25806004002 is an abundant number, since it is smaller than the sum of its proper divisors (36550519326).

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

25806004002 is a wasteful number, since it uses less digits than its factorization.

25806004002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7306 (or 7266 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 25806004002 its reverse (20040060852), we get a palindrome (45846064854).

The spelling of 25806004002 in words is "twenty-five billion, eight hundred six million, four thousand, two".