25645139565 has 8 divisors (see below), whose sum is σ = 41032223328. Its totient is φ = 13677407760.

The previous prime is 25645139563. The next prime is 25645139593. The reversal of 25645139565 is 56593154652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25645139565 - 2¹ = 25645139563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645139563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854837971 + ... + 854838000.

It is an arithmetic number, because the mean of its divisors is an integer number (5129027916).

Almost surely, 2^25645139565 is an apocalyptic number.

It is an amenable number.

25645139565 is a deficient number, since it is larger than the sum of its proper divisors (15387083763).

25645139565 is a wasteful number, since it uses less digits than its factorization.

25645139565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709675979.

The product of its digits is 4860000, while the sum is 51.

The spelling of 25645139565 in words is "twenty-five billion, six hundred forty-five million, one hundred thirty-nine thousand, five hundred sixty-five".