221593266457 has 2 divisors, whose sum is σ = 221593266458. Its totient is φ = 221593266456.

The previous prime is 221593266421. The next prime is 221593266463. The reversal of 221593266457 is 754662395122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118824294681 + 102768971776 = 344709^2 + 320576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221593266457 is a prime.

It is not a weakly prime, because it can be changed into another prime (221593266467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110796633228 + 110796633229.

It is an arithmetic number, because the mean of its divisors is an integer number (110796633229).

Almost surely, 2^221593266457 is an apocalyptic number.

It is an amenable number.

221593266457 is a deficient number, since it is larger than the sum of its proper divisors (1).

221593266457 is an equidigital number, since it uses as much as digits as its factorization.

221593266457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 52.

The spelling of 221593266457 in words is "two hundred twenty-one billion, five hundred ninety-three million, two hundred sixty-six thousand, four hundred fifty-seven".