25641305002 has 4 divisors (see below), whose sum is σ = 38461957506. Its totient is φ = 12820652500.

The previous prime is 25641304993. The next prime is 25641305009. The reversal of 25641305002 is 20050314652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25373622681 + 267682321 = 159291^2 + 16361^2 .

It is not an unprimeable number, because it can be changed into a prime (25641305009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410326249 + ... + 6410326252.

Almost surely, 2^25641305002 is an apocalyptic number.

25641305002 is a deficient number, since it is larger than the sum of its proper divisors (12820652504).

25641305002 is a wasteful number, since it uses less digits than its factorization.

25641305002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12820652503.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 25641305002 its reverse (20050314652), we get a palindrome (45691619654).

The spelling of 25641305002 in words is "twenty-five billion, six hundred forty-one million, three hundred five thousand, two".