656505673 has 4 divisors (see below), whose sum is σ = 659372740. Its totient is φ = 653638608.

The previous prime is 656505671. The next prime is 656505679. The reversal of 656505673 is 376505656.

656505673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 264940729 + 391564944 = 16277^2 + 19788^2 .

It is a cyclic number.

It is not a de Polignac number, because 656505673 - 2¹ = 656505671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656505671) 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, 1433190 + ... + 1433647.

It is an arithmetic number, because the mean of its divisors is an integer number (164843185).

Almost surely, 2^656505673 is an apocalyptic number.

It is an amenable number.

656505673 is a deficient number, since it is larger than the sum of its proper divisors (2867067).

656505673 is a wasteful number, since it uses less digits than its factorization.

656505673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867066.

The product of its (nonzero) digits is 567000, while the sum is 43.

The square root of 656505673 is about 25622.3666549365. The cubic root of 656505673 is about 869.1195006845.

The spelling of 656505673 in words is "six hundred fifty-six million, five hundred five thousand, six hundred seventy-three".