18551802025 has 9 divisors (see below), whose sum is σ = 23005079013. Its totient is φ = 14840896800.

The previous prime is 18551802011. The next prime is 18551802043. The reversal of 18551802025 is 52020815581.

The square root of 18551802025 is 136205.

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

It can be written as a sum of positive squares in 4 ways, for example, as 5828864409 + 12722937616 = 76347^2 + 112796^2 .

It is not a de Polignac number, because 18551802025 - 2¹³ = 18551793833 is a prime.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 667405 + ... + 694645.

Almost surely, 2^18551802025 is an apocalyptic number.

18551802025 is the 136205-th square number.

18551802025 is the 68103-rd centered octagonal number.

It is an amenable number.

18551802025 is a deficient number, since it is larger than the sum of its proper divisors (4453276988).

18551802025 is an frugal number, since it uses more digits than its factorization.

18551802025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54492 (or 27246 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 37.

The spelling of 18551802025 in words is "eighteen billion, five hundred fifty-one million, eight hundred two thousand, twenty-five".