25216506 has 24 divisors (see below), whose sum is σ = 62441184. Its totient is φ = 7204680.

The previous prime is 25216493. The next prime is 25216507. The reversal of 25216506 is 60561252.

25216506 is a `hidden beast` number, since 2 + 5 + 2 + 1 + 650 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25216506.

It is not an unprimeable number, because it can be changed into a prime (25216507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99940 + ... + 100191.

It is an arithmetic number, because the mean of its divisors is an integer number (2601716).

Almost surely, 2^25216506 is an apocalyptic number.

25216506 is an abundant number, since it is smaller than the sum of its proper divisors (37224678).

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

25216506 is a wasteful number, since it uses less digits than its factorization.

25216506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200146 (or 200143 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25216506 is about 5021.6039270337. The cubic root of 25216506 is about 293.2434386498.

Adding to 25216506 its reverse (60561252), we get a palindrome (85777758).

The spelling of 25216506 in words is "twenty-five million, two hundred sixteen thousand, five hundred six".