656540005 has 8 divisors (see below), whose sum is σ = 859470624. Its totient is φ = 477483600.

The previous prime is 656539981. The next prime is 656540021. The reversal of 656540005 is 500045656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656540005 - 2¹¹ = 656537957 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 5968491 + ... + 5968600.

It is an arithmetic number, because the mean of its divisors is an integer number (107433828).

Almost surely, 2^656540005 is an apocalyptic number.

It is an amenable number.

656540005 is a deficient number, since it is larger than the sum of its proper divisors (202930619).

656540005 is a wasteful number, since it uses less digits than its factorization.

656540005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937107.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 656540005 is about 25623.0366077091. The cubic root of 656540005 is about 869.1346506377.

The spelling of 656540005 in words is "six hundred fifty-six million, five hundred forty thousand, five".