25563963 has 4 divisors (see below), whose sum is σ = 34085288. Its totient is φ = 17042640.

The previous prime is 25563961. The next prime is 25563991. The reversal of 25563963 is 36936552.

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

It is not a de Polignac number, because 25563963 - 2¹ = 25563961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25563961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260658 + ... + 4260663.

It is an arithmetic number, because the mean of its divisors is an integer number (8521322).

Almost surely, 2^25563963 is an apocalyptic number.

25563963 is a deficient number, since it is larger than the sum of its proper divisors (8521325).

25563963 is an equidigital number, since it uses as much as digits as its factorization.

25563963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521324.

The product of its digits is 145800, while the sum is 39.

The square root of 25563963 is about 5056.0817833575. The cubic root of 25563963 is about 294.5841617790.

The spelling of 25563963 in words is "twenty-five million, five hundred sixty-three thousand, nine hundred sixty-three".