18019733381 has 8 divisors (see below), whose sum is σ = 19857166560. Its totient is φ = 16246771632.

The previous prime is 18019733339. The next prime is 18019733447. The reversal of 18019733381 is 18333791081.

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

It is a de Polignac number, because none of the positive numbers 2^k-18019733381 is a prime.

It is a super-2 number, since 2×18019733381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019733681) 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, 16117271 + ... + 16118388.

It is an arithmetic number, because the mean of its divisors is an integer number (2482145820).

Almost surely, 2^18019733381 is an apocalyptic number.

It is an amenable number.

18019733381 is a deficient number, since it is larger than the sum of its proper divisors (1837433179).

18019733381 is a wasteful number, since it uses less digits than its factorization.

18019733381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32235715.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 18019733381 in words is "eighteen billion, nineteen million, seven hundred thirty-three thousand, three hundred eighty-one".