18385050501 has 12 divisors (see below), whose sum is σ = 26563293900. Its totient is φ = 12253418880.

The previous prime is 18385050499. The next prime is 18385050521. The reversal of 18385050501 is 10505058381.

It can be written as a sum of positive squares in 2 ways, for example, as 8016516225 + 10368534276 = 89535^2 + 101826^2 .

It is not a de Polignac number, because 18385050501 - 2¹ = 18385050499 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385050521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237726 + ... + 305423.

It is an arithmetic number, because the mean of its divisors is an integer number (2213607825).

Almost surely, 2^18385050501 is an apocalyptic number.

It is an amenable number.

18385050501 is a deficient number, since it is larger than the sum of its proper divisors (8178243399).

18385050501 is a wasteful number, since it uses less digits than its factorization.

18385050501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546916 (or 546913 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 18385050501 in words is "eighteen billion, three hundred eighty-five million, fifty thousand, five hundred one".