25136643 has 16 divisors (see below), whose sum is σ = 38478080. Its totient is φ = 14298336.

The previous prime is 25136611. The next prime is 25136651. The reversal of 25136643 is 34663152.

It is not a de Polignac number, because 25136643 - 2⁵ = 25136611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25136643.

It is not an unprimeable number, because it can be changed into a prime (25136603) 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, 2196 + ... + 7422.

It is an arithmetic number, because the mean of its divisors is an integer number (2404880).

Almost surely, 2^25136643 is an apocalyptic number.

25136643 is a deficient number, since it is larger than the sum of its proper divisors (13341437).

25136643 is a wasteful number, since it uses less digits than its factorization.

25136643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466.

The product of its digits is 12960, while the sum is 30.

The square root of 25136643 is about 5013.6456795430. The cubic root of 25136643 is about 292.9335349168.

Adding to 25136643 its reverse (34663152), we get a palindrome (59799795).

The spelling of 25136643 in words is "twenty-five million, one hundred thirty-six thousand, six hundred forty-three".