18725505019 has 16 divisors (see below), whose sum is σ = 21169290240. Its totient is φ = 16443960480.

The previous prime is 18725505013. The next prime is 18725505061. The reversal of 18725505019 is 91050552781.

It is a cyclic number.

It is not a de Polignac number, because 18725505019 - 2¹³ = 18725496827 is a prime.

It is a super-2 number, since 2×18725505019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18725505013) 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 15 ways as a sum of consecutive naturals, for example, 369997 + ... + 417550.

It is an arithmetic number, because the mean of its divisors is an integer number (1323080640).

Almost surely, 2^18725505019 is an apocalyptic number.

18725505019 is a deficient number, since it is larger than the sum of its proper divisors (2443785221).

18725505019 is a wasteful number, since it uses less digits than its factorization.

18725505019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787650.

The product of its (nonzero) digits is 126000, while the sum is 43.

The spelling of 18725505019 in words is "eighteen billion, seven hundred twenty-five million, five hundred five thousand, nineteen".