18525528225 has 60 divisors (see below), whose sum is σ = 35045983104. Its totient is φ = 9670013280.

The previous prime is 18525528221. The next prime is 18525528233. The reversal of 18525528225 is 52282552581.

18525528225 is a `hidden beast` number, since 1 + 85 + 25 + 528 + 2 + 25 = 666.

It is not a de Polignac number, because 18525528225 - 2² = 18525528221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18525528221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2149 + ... + 192498.

Almost surely, 2^18525528225 is an apocalyptic number.

18525528225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18525528225 is a deficient number, since it is larger than the sum of its proper divisors (16520454879).

18525528225 is a wasteful number, since it uses less digits than its factorization.

18525528225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194716 (or 194702 counting only the distinct ones).

The product of its digits is 640000, while the sum is 45.

The spelling of 18525528225 in words is "eighteen billion, five hundred twenty-five million, five hundred twenty-eight thousand, two hundred twenty-five".