18123539049 has 64 divisors (see below), whose sum is σ = 33650933760. Its totient is φ = 9365328000.

The previous prime is 18123539029. The next prime is 18123539069. The reversal of 18123539049 is 94093532181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18123539029) and next prime (18123539069).

It is not a de Polignac number, because 18123539049 - 2⁷ = 18123538921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18123538995 and 18123539013.

It is not an unprimeable number, because it can be changed into a prime (18123539029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 374269 + ... + 419909.

It is an arithmetic number, because the mean of its divisors is an integer number (525795840).

Almost surely, 2^18123539049 is an apocalyptic number.

It is an amenable number.

18123539049 is a deficient number, since it is larger than the sum of its proper divisors (15527394711).

18123539049 is a wasteful number, since it uses less digits than its factorization.

18123539049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45859 (or 45853 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 18123539049 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, forty-nine".