1663406887 has 4 divisors (see below), whose sum is σ = 1668721600. Its totient is φ = 1658092176.

The previous prime is 1663406881. The next prime is 1663406903. The reversal of 1663406887 is 7886043661.

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

It is a cyclic number.

It is not a de Polignac number, because 1663406887 - 2¹¹ = 1663404839 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 1663406887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663406881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2656887 + ... + 2657512.

It is an arithmetic number, because the mean of its divisors is an integer number (417180400).

Almost surely, 2^1663406887 is an apocalyptic number.

1663406887 is a deficient number, since it is larger than the sum of its proper divisors (5314713).

1663406887 is an equidigital number, since it uses as much as digits as its factorization.

1663406887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314712.

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

The square root of 1663406887 is about 40784.8855214772. The cubic root of 1663406887 is about 1184.8576177686.

The spelling of 1663406887 in words is "one billion, six hundred sixty-three million, four hundred six thousand, eight hundred eighty-seven".