25298669857 has 4 divisors (see below), whose sum is σ = 25320092436. Its totient is φ = 25277247280.

The previous prime is 25298669839. The next prime is 25298669909. The reversal of 25298669857 is 75896689252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17169122961 + 8129546896 = 131031^2 + 90164^2 .

It is a cyclic number.

It is not a de Polignac number, because 25298669857 - 2¹¹ = 25298667809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25298669792 and 25298669801.

It is not an unprimeable number, because it can be changed into a prime (25298664857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10709518 + ... + 10711879.

It is an arithmetic number, because the mean of its divisors is an integer number (6330023109).

Almost surely, 2^25298669857 is an apocalyptic number.

It is an amenable number.

25298669857 is a deficient number, since it is larger than the sum of its proper divisors (21422579).

25298669857 is a wasteful number, since it uses less digits than its factorization.

25298669857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21422578.

The product of its digits is 130636800, while the sum is 67.

The spelling of 25298669857 in words is "twenty-five billion, two hundred ninety-eight million, six hundred sixty-nine thousand, eight hundred fifty-seven".