25255205697 has 4 divisors (see below), whose sum is σ = 33673607600. Its totient is φ = 16836803796.

The previous prime is 25255205693. The next prime is 25255205747. The reversal of 25255205697 is 79650255252.

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 25255205697 - 2² = 25255205693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25255205693) 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, 4209200947 + ... + 4209200952.

It is an arithmetic number, because the mean of its divisors is an integer number (8418401900).

Almost surely, 2^25255205697 is an apocalyptic number.

It is an amenable number.

25255205697 is a deficient number, since it is larger than the sum of its proper divisors (8418401903).

25255205697 is an equidigital number, since it uses as much as digits as its factorization.

25255205697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8418401902.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 25255205697 in words is "twenty-five billion, two hundred fifty-five million, two hundred five thousand, six hundred ninety-seven".