25813552988161 has 4 divisors (see below), whose sum is σ = 26362777519872. Its totient is φ = 25264328456452.

The previous prime is 25813552988131. The next prime is 25813552988203. The reversal of 25813552988161 is 16188925531852.

It is a happy number.

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 25813552988161 - 2³⁵ = 25779193249793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25813552988093 and 25813552988102.

It is not an unprimeable number, because it can be changed into a prime (25813552988131) 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, 274612265785 + ... + 274612265878.

It is an arithmetic number, because the mean of its divisors is an integer number (6590694379968).

Almost surely, 2^{25813552988161} is an apocalyptic number.

It is an amenable number.

25813552988161 is a deficient number, since it is larger than the sum of its proper divisors (549224531711).

25813552988161 is an equidigital number, since it uses as much as digits as its factorization.

25813552988161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549224531710.

The product of its digits is 41472000, while the sum is 64.

The spelling of 25813552988161 in words is "twenty-five trillion, eight hundred thirteen billion, five hundred fifty-two million, nine hundred eighty-eight thousand, one hundred sixty-one".