642244563 has 6 divisors (see below), whose sum is σ = 927686604. Its totient is φ = 428163036.

The previous prime is 642244553. The next prime is 642244579. The reversal of 642244563 is 365442246.

642244563 is a `hidden beast` number, since 642 + 2 + 4 + 4 + 5 + 6 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-642244563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642244553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35680245 + ... + 35680262.

It is an arithmetic number, because the mean of its divisors is an integer number (154614434).

Almost surely, 2^642244563 is an apocalyptic number.

642244563 is a deficient number, since it is larger than the sum of its proper divisors (285442041).

642244563 is a wasteful number, since it uses less digits than its factorization.

642244563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71360513 (or 71360510 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 642244563 is about 25342.5445249683. The cubic root of 642244563 is about 862.7801514633.

The spelling of 642244563 in words is "six hundred forty-two million, two hundred forty-four thousand, five hundred sixty-three".