18123539051 has 4 divisors (see below), whose sum is σ = 18465492672. Its totient is φ = 17781585432.

The previous prime is 18123539029. The next prime is 18123539069. The reversal of 18123539051 is 15093532181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18123539051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18123538996 and 18123539014.

It is not an unprimeable number, because it can be changed into a prime (18123539351) 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 3 ways as a sum of consecutive naturals, for example, 170976731 + ... + 170976836.

It is an arithmetic number, because the mean of its divisors is an integer number (4616373168).

Almost surely, 2^18123539051 is an apocalyptic number.

18123539051 is a deficient number, since it is larger than the sum of its proper divisors (341953621).

18123539051 is an equidigital number, since it uses as much as digits as its factorization.

18123539051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341953620.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 18123539051 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, fifty-one".