19887213167 has 2 divisors, whose sum is σ = 19887213168. Its totient is φ = 19887213166.

The previous prime is 19887213149. The next prime is 19887213187. The reversal of 19887213167 is 76131278891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19887213167 - 2¹² = 19887209071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19887213187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9943606583 + 9943606584.

It is an arithmetic number, because the mean of its divisors is an integer number (9943606584).

Almost surely, 2^19887213167 is an apocalyptic number.

19887213167 is a deficient number, since it is larger than the sum of its proper divisors (1).

19887213167 is an equidigital number, since it uses as much as digits as its factorization.

19887213167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The spelling of 19887213167 in words is "nineteen billion, eight hundred eighty-seven million, two hundred thirteen thousand, one hundred sixty-seven".