18799551864025 has 81 divisors (see below), whose sum is σ = 25070078635581. Its totient is φ = 13983204185280.

The previous prime is 18799551864013. The next prime is 18799551864031. The reversal of 18799551864025 is 52046815599781.

The square root of 18799551864025 is 4335845.

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 1784652856281 + 17014899007744 = 1335909^2 + 4124912^2 .

It is not a de Polignac number, because 18799551864025 - 2⁴¹ = 16600528608473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 18449019966 + ... + 18449020984.

Almost surely, 2^{18799551864025} is an apocalyptic number.

18799551864025 is the 4335845-th square number.

18799551864025 is the 2167923-rd centered octagonal number.

It is an amenable number.

18799551864025 is a deficient number, since it is larger than the sum of its proper divisors (6270526771556).

18799551864025 is an frugal number, since it uses more digits than its factorization.

18799551864025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 217728000, while the sum is 70.

The spelling of 18799551864025 in words is "eighteen trillion, seven hundred ninety-nine billion, five hundred fifty-one million, eight hundred sixty-four thousand, twenty-five".