18687333448877 has 2 divisors, whose sum is σ = 18687333448878. Its totient is φ = 18687333448876.

The previous prime is 18687333448871. The next prime is 18687333448921. The reversal of 18687333448877 is 77884433378681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13824907130596 + 4862426318281 = 3718186^2 + 2205091^2 .

It is a cyclic number.

It is not a de Polignac number, because 18687333448877 - 2³² = 18683038481581 is a prime.

It is a super-2 number, since 2×18687333448877² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18687333448798 and 18687333448807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18687333448871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343666724438 + 9343666724439.

It is an arithmetic number, because the mean of its divisors is an integer number (9343666724439).

Almost surely, 2^{18687333448877} is an apocalyptic number.

It is an amenable number.

18687333448877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18687333448877 is an equidigital number, since it uses as much as digits as its factorization.

18687333448877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3641573376, while the sum is 77.

The spelling of 18687333448877 in words is "eighteen trillion, six hundred eighty-seven billion, three hundred thirty-three million, four hundred forty-eight thousand, eight hundred seventy-seven".