25641001001 has 16 divisors (see below), whose sum is σ = 31979612160. Its totient is φ = 19972744080.

The previous prime is 25641000937. The next prime is 25641001027. The reversal of 25641001001 is 10010014652.

It is a cyclic number.

It is not a de Polignac number, because 25641001001 - 2⁶ = 25641000937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25641001051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158000 + ... + 276126.

It is an arithmetic number, because the mean of its divisors is an integer number (1998725760).

Almost surely, 2^25641001001 is an apocalyptic number.

It is an amenable number.

25641001001 is a deficient number, since it is larger than the sum of its proper divisors (6338611159).

25641001001 is a wasteful number, since it uses less digits than its factorization.

25641001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120964.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 25641001001 its reverse (10010014652), we get a palindrome (35651015653).

The spelling of 25641001001 in words is "twenty-five billion, six hundred forty-one million, one thousand, one".