18543630625 has 45 divisors (see below), whose sum is σ = 25151732463. Its totient is φ = 13661076000.

The previous prime is 18543630587. The next prime is 18543630643. The reversal of 18543630625 is 52603634581.

The square root of 18543630625 is 136175.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 18316103569 + 227527056 = 135337^2 + 15084^2 .

It is not a de Polignac number, because 18543630625 - 2⁹ = 18543630113 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 44256666 + ... + 44257084.

Almost surely, 2^18543630625 is an apocalyptic number.

18543630625 is the 136175-th square number.

18543630625 is the 68088-th centered octagonal number.

It is an amenable number.

18543630625 is a deficient number, since it is larger than the sum of its proper divisors (6608101838).

18543630625 is an frugal number, since it uses more digits than its factorization.

18543630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 18543630625 in words is "eighteen billion, five hundred forty-three million, six hundred thirty thousand, six hundred twenty-five".