1663563243 has 8 divisors (see below), whose sum is σ = 2218295808. Its totient is φ = 1108936424.

The previous prime is 1663563229. The next prime is 1663563247. The reversal of 1663563243 is 3423653661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663563243 - 2⁵ = 1663563211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663563247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24046 + ... + 62492.

It is an arithmetic number, because the mean of its divisors is an integer number (277286976).

Almost surely, 2^1663563243 is an apocalyptic number.

1663563243 is a deficient number, since it is larger than the sum of its proper divisors (554732565).

1663563243 is a wasteful number, since it uses less digits than its factorization.

1663563243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52873.

The product of its digits is 233280, while the sum is 39.

The square root of 1663563243 is about 40786.8023139839. The cubic root of 1663563243 is about 1184.8947411357.

The spelling of 1663563243 in words is "one billion, six hundred sixty-three million, five hundred sixty-three thousand, two hundred forty-three".