25466097561 has 16 divisors (see below), whose sum is σ = 35483695104. Its totient is φ = 16229750544.

The previous prime is 25466097557. The next prime is 25466097583. The reversal of 25466097561 is 16579066452.

It is not a de Polignac number, because 25466097561 - 2² = 25466097557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25466097511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2094061 + ... + 2106186.

It is an arithmetic number, because the mean of its divisors is an integer number (2217730944).

Almost surely, 2^25466097561 is an apocalyptic number.

It is an amenable number.

25466097561 is a deficient number, since it is larger than the sum of its proper divisors (10017597543).

25466097561 is a wasteful number, since it uses less digits than its factorization.

25466097561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200340.

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 25466097561 in words is "twenty-five billion, four hundred sixty-six million, ninety-seven thousand, five hundred sixty-one".