25518563 has 6 divisors (see below), whose sum is σ = 29684916. Its totient is φ = 21873012.

The previous prime is 25518553. The next prime is 25518583. The reversal of 25518563 is 36581552.

It is not a de Polignac number, because 25518563 - 2⁶ = 25518499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25518533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 260345 + ... + 260442.

It is an arithmetic number, because the mean of its divisors is an integer number (4947486).

Almost surely, 2^25518563 is an apocalyptic number.

25518563 is a deficient number, since it is larger than the sum of its proper divisors (4166353).

25518563 is an equidigital number, since it uses as much as digits as its factorization.

25518563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520801 (or 520794 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 25518563 is about 5051.5901456868. The cubic root of 25518563 is about 294.4096707586.

The spelling of 25518563 in words is "twenty-five million, five hundred eighteen thousand, five hundred sixty-three".