18918242849 has 8 divisors (see below), whose sum is σ = 20827424640. Its totient is φ = 17040618000.

The previous prime is 18918242843. The next prime is 18918242881. The reversal of 18918242849 is 94824281981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18918242849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18918242794 and 18918242803.

It is not an unprimeable number, because it can be changed into a prime (18918242843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7887977 + ... + 7890374.

It is an arithmetic number, because the mean of its divisors is an integer number (2603428080).

Almost surely, 2^18918242849 is an apocalyptic number.

It is an amenable number.

18918242849 is a deficient number, since it is larger than the sum of its proper divisors (1909181791).

18918242849 is a wasteful number, since it uses less digits than its factorization.

18918242849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778471.

The product of its digits is 2654208, while the sum is 56.

The spelling of 18918242849 in words is "eighteen billion, nine hundred eighteen million, two hundred forty-two thousand, eight hundred forty-nine".