221563065257 has 2 divisors, whose sum is σ = 221563065258. Its totient is φ = 221563065256.

The previous prime is 221563065239. The next prime is 221563065349. The reversal of 221563065257 is 752560365122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156729683881 + 64833381376 = 395891^2 + 254624^2 .

It is a cyclic number.

It is not a de Polignac number, because 221563065257 - 2¹⁸ = 221562803113 is a prime.

It is not a weakly prime, because it can be changed into another prime (221563068257) 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 as a sum of consecutive naturals, namely, 110781532628 + 110781532629.

It is an arithmetic number, because the mean of its divisors is an integer number (110781532629).

Almost surely, 2^221563065257 is an apocalyptic number.

It is an amenable number.

221563065257 is a deficient number, since it is larger than the sum of its proper divisors (1).

221563065257 is an equidigital number, since it uses as much as digits as its factorization.

221563065257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 221563065257 in words is "two hundred twenty-one billion, five hundred sixty-three million, sixty-five thousand, two hundred fifty-seven".