673656563 has 4 divisors (see below), whose sum is σ = 673729488. Its totient is φ = 673583640.

The previous prime is 673656559. The next prime is 673656601. The reversal of 673656563 is 365656376.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 673656563 - 2² = 673656559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673656523) 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, 20183 + ... + 41888.

It is an arithmetic number, because the mean of its divisors is an integer number (168432372).

Almost surely, 2^673656563 is an apocalyptic number.

673656563 is a deficient number, since it is larger than the sum of its proper divisors (72925).

673656563 is a wasteful number, since it uses less digits than its factorization.

673656563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72924.

The product of its digits is 2041200, while the sum is 47.

The square root of 673656563 is about 25954.8947792126. The cubic root of 673656563 is about 876.6229744128.

The spelling of 673656563 in words is "six hundred seventy-three million, six hundred fifty-six thousand, five hundred sixty-three".