1563225643 has 4 divisors (see below), whose sum is σ = 1786543600. Its totient is φ = 1339907688.

The previous prime is 1563225563. The next prime is 1563225679. The reversal of 1563225643 is 3465223651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3465223651 = 151 ⋅22948501.

It is not a de Polignac number, because 1563225643 - 2¹³ = 1563217451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1563225343) 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, 111658968 + ... + 111658981.

It is an arithmetic number, because the mean of its divisors is an integer number (446635900).

Almost surely, 2^1563225643 is an apocalyptic number.

1563225643 is a deficient number, since it is larger than the sum of its proper divisors (223317957).

1563225643 is an equidigital number, since it uses as much as digits as its factorization.

1563225643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223317956.

The product of its digits is 129600, while the sum is 37.

The square root of 1563225643 is about 39537.6484252668. The cubic root of 1563225643 is about 1160.5768145461.

The spelling of 1563225643 in words is "one billion, five hundred sixty-three million, two hundred twenty-five thousand, six hundred forty-three".