656216656673 has 2 divisors, whose sum is σ = 656216656674. Its totient is φ = 656216656672.

The previous prime is 656216656643. The next prime is 656216656679. The reversal of 656216656673 is 376656612656.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423167163169 + 233049493504 = 650513^2 + 482752^2 .

It is a cyclic number.

It is not a de Polignac number, because 656216656673 - 2³⁶ = 587497179937 is a prime.

It is not a weakly prime, because it can be changed into another prime (656216656679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328108328336 + 328108328337.

It is an arithmetic number, because the mean of its divisors is an integer number (328108328337).

Almost surely, 2^656216656673 is an apocalyptic number.

It is an amenable number.

656216656673 is a deficient number, since it is larger than the sum of its proper divisors (1).

656216656673 is an equidigital number, since it uses as much as digits as its factorization.

656216656673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48988800, while the sum is 59.

The spelling of 656216656673 in words is "six hundred fifty-six billion, two hundred sixteen million, six hundred fifty-six thousand, six hundred seventy-three".