18838162181 has 4 divisors (see below), whose sum is σ = 19445844864. Its totient is φ = 18230479500.

The previous prime is 18838162153. The next prime is 18838162201. The reversal of 18838162181 is 18126183881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18838162181 - 2¹⁴ = 18838145797 is a prime.

It is a super-2 number, since 2×18838162181² (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 (18838162381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303841295 + ... + 303841356.

It is an arithmetic number, because the mean of its divisors is an integer number (4861461216).

Almost surely, 2^18838162181 is an apocalyptic number.

It is an amenable number.

18838162181 is a deficient number, since it is larger than the sum of its proper divisors (607682683).

18838162181 is an equidigital number, since it uses as much as digits as its factorization.

18838162181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607682682.

The product of its digits is 147456, while the sum is 47.

The spelling of 18838162181 in words is "eighteen billion, eight hundred thirty-eight million, one hundred sixty-two thousand, one hundred eighty-one".