18705018381 has 12 divisors (see below), whose sum is σ = 29011865472. Its totient is φ = 10688581848.

The previous prime is 18705018379. The next prime is 18705018389. The reversal of 18705018381 is 18381050781.

It is not a de Polignac number, because 18705018381 - 2¹ = 18705018379 is a prime.

It is a super-2 number, since 2×18705018381² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705018389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63622365 + ... + 63622658.

It is an arithmetic number, because the mean of its divisors is an integer number (2417655456).

Almost surely, 2^18705018381 is an apocalyptic number.

It is an amenable number.

18705018381 is a deficient number, since it is larger than the sum of its proper divisors (10306847091).

18705018381 is a wasteful number, since it uses less digits than its factorization.

18705018381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127245040 (or 127245033 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 42.

The spelling of 18705018381 in words is "eighteen billion, seven hundred five million, eighteen thousand, three hundred eighty-one".