25128868580641 has 4 divisors (see below), whose sum is σ = 28718706949312. Its totient is φ = 21539030211972.

The previous prime is 25128868580623. The next prime is 25128868580671. The reversal of 25128868580641 is 14608586882152.

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 not a de Polignac number, because 25128868580641 - 2⁵ = 25128868580609 is a prime.

It is a super-2 number, since 2×25128868580641² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25128868580671) 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, 1794919184325 + ... + 1794919184338.

It is an arithmetic number, because the mean of its divisors is an integer number (7179676737328).

Almost surely, 2^{25128868580641} is an apocalyptic number.

It is an amenable number.

25128868580641 is a deficient number, since it is larger than the sum of its proper divisors (3589838368671).

25128868580641 is an equidigital number, since it uses as much as digits as its factorization.

25128868580641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589838368670.

The product of its (nonzero) digits is 58982400, while the sum is 64.

The spelling of 25128868580641 in words is "twenty-five trillion, one hundred twenty-eight billion, eight hundred sixty-eight million, five hundred eighty thousand, six hundred forty-one".