656566552641 has 4 divisors (see below), whose sum is σ = 875422070192. Its totient is φ = 437711035092.

The previous prime is 656566552601. The next prime is 656566552661. The reversal of 656566552641 is 146255665656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 656566552641 - 2¹⁰ = 656566551617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656566552601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109427758771 + ... + 109427758776.

It is an arithmetic number, because the mean of its divisors is an integer number (218855517548).

Almost surely, 2^656566552641 is an apocalyptic number.

It is an amenable number.

656566552641 is a deficient number, since it is larger than the sum of its proper divisors (218855517551).

656566552641 is a wasteful number, since it uses less digits than its factorization.

656566552641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218855517550.

The product of its digits is 38880000, while the sum is 57.

The spelling of 656566552641 in words is "six hundred fifty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, six hundred forty-one".