1919563663 has 4 divisors (see below), whose sum is σ = 1971443800. Its totient is φ = 1867683528.

The previous prime is 1919563661. The next prime is 1919563669. The reversal of 1919563663 is 3663659191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3663659191 = 181 ⋅20241211.

It is a cyclic number.

It is not a de Polignac number, because 1919563663 - 2¹ = 1919563661 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 (1919563661) 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, 25940013 + ... + 25940086.

It is an arithmetic number, because the mean of its divisors is an integer number (492860950).

Almost surely, 2^1919563663 is an apocalyptic number.

1919563663 is a deficient number, since it is larger than the sum of its proper divisors (51880137).

1919563663 is an equidigital number, since it uses as much as digits as its factorization.

1919563663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51880136.

The product of its digits is 787320, while the sum is 49.

The square root of 1919563663 is about 43812.8253254683. The cubic root of 1919563663 is about 1242.7988424351.

The spelling of 1919563663 in words is "one billion, nine hundred nineteen million, five hundred sixty-three thousand, six hundred sixty-three".