1663228687 has 2 divisors, whose sum is σ = 1663228688. Its totient is φ = 1663228686.

The previous prime is 1663228661. The next prime is 1663228727. The reversal of 1663228687 is 7868223661.

It is a weak prime.

It is an emirp because it is prime and its reverse (7868223661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663228687 - 2¹⁹ = 1662704399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663228687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663228487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831614343 + 831614344.

It is an arithmetic number, because the mean of its divisors is an integer number (831614344).

Almost surely, 2^1663228687 is an apocalyptic number.

1663228687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663228687 is an equidigital number, since it uses as much as digits as its factorization.

1663228687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 1663228687 is about 40782.7008301314. The cubic root of 1663228687 is about 1184.8153051772.

The spelling of 1663228687 in words is "one billion, six hundred sixty-three million, two hundred twenty-eight thousand, six hundred eighty-seven".