656213220277 has 2 divisors, whose sum is σ = 656213220278. Its totient is φ = 656213220276.

The previous prime is 656213220263. The next prime is 656213220301. The reversal of 656213220277 is 772022312656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475712298961 + 180500921316 = 689719^2 + 424854^2 .

It is a cyclic number.

It is not a de Polignac number, because 656213220277 - 2¹¹ = 656213218229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656213220217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328106610138 + 328106610139.

It is an arithmetic number, because the mean of its divisors is an integer number (328106610139).

Almost surely, 2^656213220277 is an apocalyptic number.

It is an amenable number.

656213220277 is a deficient number, since it is larger than the sum of its proper divisors (1).

656213220277 is an equidigital number, since it uses as much as digits as its factorization.

656213220277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 656213220277 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred twenty thousand, two hundred seventy-seven".