18878087881 has 2 divisors, whose sum is σ = 18878087882. Its totient is φ = 18878087880.

The previous prime is 18878087843. The next prime is 18878087933.

18878087881 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18798877881 + 79210000 = 137109^2 + 8900^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 18878087881 - 2¹⁵ = 18878055113 is a prime.

It is a super-2 number, since 2×18878087881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18878087581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439043940 + 9439043941.

It is an arithmetic number, because the mean of its divisors is an integer number (9439043941).

Almost surely, 2^18878087881 is an apocalyptic number.

It is an amenable number.

18878087881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878087881 is an equidigital number, since it uses as much as digits as its factorization.

18878087881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12845056, while the sum is 64.

The spelling of 18878087881 in words is "eighteen billion, eight hundred seventy-eight million, eighty-seven thousand, eight hundred eighty-one".