6563642 has 4 divisors (see below), whose sum is σ = 9845466. Its totient is φ = 3281820.

The previous prime is 6563639. The next prime is 6563659. The reversal of 6563642 is 2463656.

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

It can be written as a sum of positive squares in only one way, i.e., 6046681 + 516961 = 2459^2 + 719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6563599 and 6563608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640909 + ... + 1640912.

Almost surely, 2^6563642 is an apocalyptic number.

6563642 is a deficient number, since it is larger than the sum of its proper divisors (3281824).

6563642 is a wasteful number, since it uses less digits than its factorization.

6563642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281823.

The product of its digits is 25920, while the sum is 32.

The square root of 6563642 is about 2561.9605773704. The cubic root of 6563642 is about 187.2326691042.

The spelling of 6563642 in words is "six million, five hundred sixty-three thousand, six hundred forty-two".