6622664787887 has 2 divisors, whose sum is σ = 6622664787888. Its totient is φ = 6622664787886.

The previous prime is 6622664787863. The next prime is 6622664787889. The reversal of 6622664787887 is 7887874662266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6622664787887 - 2²⁸ = 6622396352431 is a prime.

Together with 6622664787889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6622664787889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311332393943 + 3311332393944.

It is an arithmetic number, because the mean of its divisors is an integer number (3311332393944).

Almost surely, 2^{6622664787887} is an apocalyptic number.

6622664787887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6622664787887 is an equidigital number, since it uses as much as digits as its factorization.

6622664787887 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 6622664787887 in words is "six trillion, six hundred twenty-two billion, six hundred sixty-four million, seven hundred eighty-seven thousand, eight hundred eighty-seven".