1687788221575 has 12 divisors (see below), whose sum is σ = 2092888783648. Its totient is φ = 1350210326400.

The previous prime is 1687788221569. The next prime is 1687788221611. The reversal of 1687788221575 is 5751228877861.

It is not a de Polignac number, because 1687788221575 - 2⁵ = 1687788221543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1687788221575.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1323634 + ... + 2264416.

Almost surely, 2^{1687788221575} is an apocalyptic number.

1687788221575 is a deficient number, since it is larger than the sum of its proper divisors (405100562073).

1687788221575 is an equidigital number, since it uses as much as digits as its factorization.

1687788221575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012554 (or 1012549 counting only the distinct ones).

The product of its digits is 105369600, while the sum is 67.

The spelling of 1687788221575 in words is "one trillion, six hundred eighty-seven billion, seven hundred eighty-eight million, two hundred twenty-one thousand, five hundred seventy-five".