1687894221227 has 4 divisors (see below), whose sum is σ = 1687898323800. Its totient is φ = 1687890118656.

The previous prime is 1687894221197. The next prime is 1687894221257. The reversal of 1687894221227 is 7221224987861.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1687894221197) and next prime (1687894221257).

It is a cyclic number.

It is not a de Polignac number, because 1687894221227 - 2¹⁰ = 1687894220203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687894221257) 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 in 3 ways as a sum of consecutive naturals, for example, 1355477 + ... + 2283222.

It is an arithmetic number, because the mean of its divisors is an integer number (421974580950).

Almost surely, 2^{1687894221227} is an apocalyptic number.

1687894221227 is a deficient number, since it is larger than the sum of its proper divisors (4102573).

1687894221227 is an equidigital number, since it uses as much as digits as its factorization.

1687894221227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102572.

The product of its digits is 10838016, while the sum is 59.

The spelling of 1687894221227 in words is "one trillion, six hundred eighty-seven billion, eight hundred ninety-four million, two hundred twenty-one thousand, two hundred twenty-seven".