1663194243 has 4 divisors (see below), whose sum is σ = 2217592328. Its totient is φ = 1108796160.

The previous prime is 1663194199. The next prime is 1663194257. The reversal of 1663194243 is 3424913661.

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

It is not a de Polignac number, because 1663194243 - 2¹⁰ = 1663193219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663194293) 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, 277199038 + ... + 277199043.

It is an arithmetic number, because the mean of its divisors is an integer number (554398082).

Almost surely, 2^1663194243 is an apocalyptic number.

1663194243 is a deficient number, since it is larger than the sum of its proper divisors (554398085).

1663194243 is an equidigital number, since it uses as much as digits as its factorization.

1663194243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554398084.

The product of its digits is 93312, while the sum is 39.

The square root of 1663194243 is about 40782.2785410526. The cubic root of 1663194243 is about 1184.8071262939.

The spelling of 1663194243 in words is "one billion, six hundred sixty-three million, one hundred ninety-four thousand, two hundred forty-three".