25665850585 has 16 divisors (see below), whose sum is σ = 30865317120. Its totient is φ = 20488533120.

The previous prime is 25665850583. The next prime is 25665850591. The reversal of 25665850585 is 58505856652.

It is a happy number.

It is not a de Polignac number, because 25665850585 - 2¹ = 25665850583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25665850583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7066720 + ... + 7070350.

It is an arithmetic number, because the mean of its divisors is an integer number (1929082320).

Almost surely, 2^25665850585 is an apocalyptic number.

It is an amenable number.

25665850585 is a deficient number, since it is larger than the sum of its proper divisors (5199466535).

25665850585 is a wasteful number, since it uses less digits than its factorization.

25665850585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6288.

The product of its (nonzero) digits is 14400000, while the sum is 55.

The spelling of 25665850585 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, five hundred eighty-five".