25663123 has 4 divisors (see below), whose sum is σ = 25683088. Its totient is φ = 25643160.

The previous prime is 25663117. The next prime is 25663151. The reversal of 25663123 is 32136652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25663123 is a prime.

It is a super-2 number, since 2×25663123² = 1317191764226258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25663091 and 25663100.

It is not an unprimeable number, because it can be changed into a prime (25663823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7911 + ... + 10672.

It is an arithmetic number, because the mean of its divisors is an integer number (6420772).

Almost surely, 2^25663123 is an apocalyptic number.

25663123 is a deficient number, since it is larger than the sum of its proper divisors (19965).

25663123 is a wasteful number, since it uses less digits than its factorization.

25663123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19964.

The product of its digits is 6480, while the sum is 28.

The square root of 25663123 is about 5065.8783048944. The cubic root of 25663123 is about 294.9645576495.

Adding to 25663123 its reverse (32136652), we get a palindrome (57799775).

The spelling of 25663123 in words is "twenty-five million, six hundred sixty-three thousand, one hundred twenty-three".