18545031225 has 216 divisors, whose sum is σ = 40958211840. Its totient is φ = 7975376640.

The previous prime is 18545031223. The next prime is 18545031227. The reversal of 18545031225 is 52213054581.

18545031225 is a `hidden beast` number, since 1 + 85 + 450 + 3 + 122 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (18545031223) and next prime (18545031227).

It is not a de Polignac number, because 18545031225 - 2¹ = 18545031223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18545031225.

It is not an unprimeable number, because it can be changed into a prime (18545031221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 46712727 + ... + 46713123.

Almost surely, 2^18545031225 is an apocalyptic number.

18545031225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18545031225 is an abundant number, since it is smaller than the sum of its proper divisors (22413180615).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18545031225 is a wasteful number, since it uses less digits than its factorization.

18545031225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 18545031225 in words is "eighteen billion, five hundred forty-five million, thirty-one thousand, two hundred twenty-five".