220566557 has 2 divisors, whose sum is σ = 220566558. Its totient is φ = 220566556.

The previous prime is 220566473. The next prime is 220566559. The reversal of 220566557 is 755665022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144336196 + 76230361 = 12014^2 + 8731^2 .

It is a cyclic number.

It is not a de Polignac number, because 220566557 - 2²⁶ = 153457693 is a prime.

Together with 220566559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220566557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220566559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110283278 + 110283279.

It is an arithmetic number, because the mean of its divisors is an integer number (110283279).

Almost surely, 2^220566557 is an apocalyptic number.

It is an amenable number.

220566557 is a deficient number, since it is larger than the sum of its proper divisors (1).

220566557 is an equidigital number, since it uses as much as digits as its factorization.

220566557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 220566557 is about 14851.4833265906. The cubic root of 220566557 is about 604.1988411963.

It can be divided in two parts, 2 and 20566557, that multiplied together give a palindrome (41133114).

The spelling of 220566557 in words is "two hundred twenty million, five hundred sixty-six thousand, five hundred fifty-seven".