25853395009 has 4 divisors (see below), whose sum is σ = 27842117716. Its totient is φ = 23864672304.

The previous prime is 25853394979. The next prime is 25853395027. The reversal of 25853395009 is 90059335852.

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 2474067600 + 23379327409 = 49740^2 + 152903^2 .

It is a cyclic number.

It is not a de Polignac number, because 25853395009 - 2⁵ = 25853394977 is a prime.

It is a super-2 number, since 2×25853395009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25853395069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994361334 + ... + 994361359.

It is an arithmetic number, because the mean of its divisors is an integer number (6960529429).

Almost surely, 2^25853395009 is an apocalyptic number.

It is an amenable number.

25853395009 is a deficient number, since it is larger than the sum of its proper divisors (1988722707).

25853395009 is a wasteful number, since it uses less digits than its factorization.

25853395009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988722706.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 25853395009 in words is "twenty-five billion, eight hundred fifty-three million, three hundred ninety-five thousand, nine".