25170645 has 16 divisors (see below), whose sum is σ = 40335552. Its totient is φ = 13403520.

The previous prime is 25170641. The next prime is 25170647. The reversal of 25170645 is 54607152.

It is not a de Polignac number, because 25170645 - 2² = 25170641 is a prime.

It is a super-2 number, since 2×25170645² = 1267122739432050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25170641) 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, 16849 + ... + 18281.

It is an arithmetic number, because the mean of its divisors is an integer number (2520972).

Almost surely, 2^25170645 is an apocalyptic number.

It is an amenable number.

25170645 is a deficient number, since it is larger than the sum of its proper divisors (15164907).

25170645 is a wasteful number, since it uses less digits than its factorization.

25170645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 25170645 is about 5017.0354792447. The cubic root of 25170645 is about 293.0655578280.

Adding to 25170645 its reverse (54607152), we get a palindrome (79777797).

The spelling of 25170645 in words is "twenty-five million, one hundred seventy thousand, six hundred forty-five".