25385842665 has 40 divisors (see below), whose sum is σ = 47075684040. Its totient is φ = 13072243968.

The previous prime is 25385842663. The next prime is 25385842679. The reversal of 25385842665 is 56624858352.

25385842665 is a `hidden beast` number, since 2 + 5 + 38 + 584 + 26 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8447080464 + 16938762201 = 91908^2 + 130149^2 .

It is not a de Polignac number, because 25385842665 - 2¹ = 25385842663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25385842663) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1068964 + ... + 1092453.

It is an arithmetic number, because the mean of its divisors is an integer number (1176892101).

Almost surely, 2^25385842665 is an apocalyptic number.

It is an amenable number.

25385842665 is a deficient number, since it is larger than the sum of its proper divisors (21689841375).

25385842665 is a wasteful number, since it uses less digits than its factorization.

25385842665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161463 (or 2161454 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 54.

The spelling of 25385842665 in words is "twenty-five billion, three hundred eighty-five million, eight hundred forty-two thousand, six hundred sixty-five".