18933605381 has 8 divisors (see below), whose sum is σ = 20234707200. Its totient is φ = 17653321408.

The previous prime is 18933605321. The next prime is 18933605387. The reversal of 18933605381 is 18350633981.

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

It is a cyclic number.

It is not a de Polignac number, because 18933605381 - 2¹⁴ = 18933588997 is a prime.

It is a super-2 number, since 2×18933605381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18933605387) 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, 5202581 + ... + 5206218.

It is an arithmetic number, because the mean of its divisors is an integer number (2529338400).

Almost surely, 2^18933605381 is an apocalyptic number.

It is an amenable number.

18933605381 is a deficient number, since it is larger than the sum of its proper divisors (1301101819).

18933605381 is a wasteful number, since it uses less digits than its factorization.

18933605381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10408923.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 18933605381 in words is "eighteen billion, nine hundred thirty-three million, six hundred five thousand, three hundred eighty-one".