1563635042 has 6 divisors (see below), whose sum is σ = 2345536449. Its totient is φ = 781789560.

The previous prime is 1563635011. The next prime is 1563635089. The reversal of 1563635042 is 2405363651.

It can be written as a sum of positive squares in 2 ways, for example, as 1443316081 + 120318961 = 37991^2 + 10969^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=27961.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1563634993 and 1563635011.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 41942 + ... + 69902.

Almost surely, 2^1563635042 is an apocalyptic number.

1563635042 is a deficient number, since it is larger than the sum of its proper divisors (781901407).

1563635042 is an frugal number, since it uses more digits than its factorization.

1563635042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55924 (or 27963 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 1563635042 is about 39542.8254175141. The cubic root of 1563635042 is about 1160.6781216344.

Multiplying 1563635042 by its product of nonzero digits (64800), we get a square (101323550721600 = 10065960²).

Adding to 1563635042 its reverse (2405363651), we get a palindrome (3968998693).

The spelling of 1563635042 in words is "one billion, five hundred sixty-three million, six hundred thirty-five thousand, forty-two".