1916806663 has 4 divisors (see below), whose sum is σ = 1978639168. Its totient is φ = 1854974160.

The previous prime is 1916806613. The next prime is 1916806669. The reversal of 1916806663 is 3666086191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3666086191 = 97 ⋅37794703.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1916806663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916806669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30916206 + ... + 30916267.

It is an arithmetic number, because the mean of its divisors is an integer number (494659792).

Almost surely, 2^1916806663 is an apocalyptic number.

1916806663 is a deficient number, since it is larger than the sum of its proper divisors (61832505).

1916806663 is an equidigital number, since it uses as much as digits as its factorization.

1916806663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61832504.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1916806663 is about 43781.3506301484. The cubic root of 1916806663 is about 1242.2035616450.

The spelling of 1916806663 in words is "one billion, nine hundred sixteen million, eight hundred six thousand, six hundred sixty-three".