18982278129 has 4 divisors (see below), whose sum is σ = 25309704176. Its totient is φ = 12654852084.

The previous prime is 18982278121. The next prime is 18982278131. The reversal of 18982278129 is 92187228981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92187228981 = 3 ⋅30729076327.

It is not a de Polignac number, because 18982278129 - 2³ = 18982278121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18982278121) 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, 3163713019 + ... + 3163713024.

It is an arithmetic number, because the mean of its divisors is an integer number (6327426044).

Almost surely, 2^18982278129 is an apocalyptic number.

It is an amenable number.

18982278129 is a deficient number, since it is larger than the sum of its proper divisors (6327426047).

18982278129 is an equidigital number, since it uses as much as digits as its factorization.

18982278129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327426046.

The product of its digits is 2322432, while the sum is 57.

The spelling of 18982278129 in words is "eighteen billion, nine hundred eighty-two million, two hundred seventy-eight thousand, one hundred twenty-nine".