18725565 has 16 divisors (see below), whose sum is σ = 31264128. Its totient is φ = 9552576.

The previous prime is 18725563. The next prime is 18725573. The reversal of 18725565 is 56552781.

It is not a de Polignac number, because 18725565 - 2¹ = 18725563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725563) 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, 26794 + ... + 27483.

It is an arithmetic number, because the mean of its divisors is an integer number (1954008).

Almost surely, 2^18725565 is an apocalyptic number.

18725565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18725565 is a deficient number, since it is larger than the sum of its proper divisors (12538563).

18725565 is a wasteful number, since it uses less digits than its factorization.

18725565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54308.

The product of its digits is 84000, while the sum is 39.

The square root of 18725565 is about 4327.3045883090. The cubic root of 18725565 is about 265.5491874069.

It can be divided in two parts, 187 and 25565, that added together give a palindrome (25752).

The spelling of 18725565 in words is "eighteen million, seven hundred twenty-five thousand, five hundred sixty-five".