25755874721 has 4 divisors (see below), whose sum is σ = 25756473600. Its totient is φ = 25755275844.

The previous prime is 25755874709. The next prime is 25755874763. The reversal of 25755874721 is 12747855752.

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 a de Polignac number, because none of the positive numbers 2^k-25755874721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25755874321) 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, 229481 + ... + 322758.

It is an arithmetic number, because the mean of its divisors is an integer number (6439118400).

Almost surely, 2^25755874721 is an apocalyptic number.

It is an amenable number.

25755874721 is a deficient number, since it is larger than the sum of its proper divisors (598879).

25755874721 is an equidigital number, since it uses as much as digits as its factorization.

25755874721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598878.

The product of its digits is 5488000, while the sum is 53.

The spelling of 25755874721 in words is "twenty-five billion, seven hundred fifty-five million, eight hundred seventy-four thousand, seven hundred twenty-one".