220666541 has 2 divisors, whose sum is σ = 220666542. Its totient is φ = 220666540.

The previous prime is 220666529. The next prime is 220666573. The reversal of 220666541 is 145666022.

It is an a-pointer prime, because the next prime (220666573) can be obtained adding 220666541 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217444516 + 3222025 = 14746^2 + 1795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220666541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220666498 and 220666507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220666241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110333270 + 110333271.

It is an arithmetic number, because the mean of its divisors is an integer number (110333271).

Almost surely, 2^220666541 is an apocalyptic number.

It is an amenable number.

220666541 is a deficient number, since it is larger than the sum of its proper divisors (1).

220666541 is an equidigital number, since it uses as much as digits as its factorization.

220666541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 220666541 is about 14854.8490736190. The cubic root of 220666541 is about 604.2901229270.

The spelling of 220666541 in words is "two hundred twenty million, six hundred sixty-six thousand, five hundred forty-one".