25197073968161 has 4 divisors (see below), whose sum is σ = 25197382795824. Its totient is φ = 25196765140500.

The previous prime is 25197073968133. The next prime is 25197073968163. The reversal of 25197073968161 is 16186937079152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25197073968161 - 2¹⁰ = 25197073967137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25197073968163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154291415 + ... + 154454636.

It is an arithmetic number, because the mean of its divisors is an integer number (6299345698956).

Almost surely, 2^{25197073968161} is an apocalyptic number.

It is an amenable number.

25197073968161 is a deficient number, since it is larger than the sum of its proper divisors (308827663).

25197073968161 is an equidigital number, since it uses as much as digits as its factorization.

25197073968161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308827662.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 25197073968161 in words is "twenty-five trillion, one hundred ninety-seven billion, seventy-three million, nine hundred sixty-eight thousand, one hundred sixty-one".