25665256652 has 72 divisors (see below), whose sum is σ = 55059510240. Its totient is φ = 10416806400.

The previous prime is 25665256633. The next prime is 25665256663.

25665256652 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 25665256652.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 427124 + ... + 483492.

It is an arithmetic number, because the mean of its divisors is an integer number (764715420).

Almost surely, 2^25665256652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25665256652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27529755120).

25665256652 is an abundant number, since it is smaller than the sum of its proper divisors (29394253588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25665256652 is a wasteful number, since it uses less digits than its factorization.

25665256652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56511 (or 56502 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 50.

The spelling of 25665256652 in words is "twenty-five billion, six hundred sixty-five million, two hundred fifty-six thousand, six hundred fifty-two".