18219337857 has 28 divisors (see below), whose sum is σ = 31218878080. Its totient is φ = 10411047288.

The previous prime is 18219337849. The next prime is 18219337867. The reversal of 18219337857 is 75873391281.

It is a happy number.

18219337857 is a `hidden beast` number, since 1 + 8 + 219 + 3 + 378 + 57 = 666.

It is not a de Polignac number, because 18219337857 - 2³ = 18219337849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18219337817) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1780057 + ... + 1790262.

Almost surely, 2^18219337857 is an apocalyptic number.

It is an amenable number.

18219337857 is a deficient number, since it is larger than the sum of its proper divisors (12999540223).

18219337857 is an frugal number, since it uses more digits than its factorization.

18219337857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570344 (or 3570329 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 18219337857 in words is "eighteen billion, two hundred nineteen million, three hundred thirty-seven thousand, eight hundred fifty-seven".