18729120025 has 96 divisors (see below), whose sum is σ = 30228422400. Its totient is φ = 11169177600.

The previous prime is 18729120023. The next prime is 18729120049. The reversal of 18729120025 is 52002192781.

It is not a de Polignac number, because 18729120025 - 2¹ = 18729120023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18729120023) 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 95 ways as a sum of consecutive naturals, for example, 6306741 + ... + 6309709.

It is an arithmetic number, because the mean of its divisors is an integer number (314879400).

Almost surely, 2^18729120025 is an apocalyptic number.

It is an amenable number.

18729120025 is a deficient number, since it is larger than the sum of its proper divisors (11499302375).

18729120025 is a wasteful number, since it uses less digits than its factorization.

18729120025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3134 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 18729120025 in words is "eighteen billion, seven hundred twenty-nine million, one hundred twenty thousand, twenty-five".