220416661 has 2 divisors, whose sum is σ = 220416662. Its totient is φ = 220416660.

The previous prime is 220416653. The next prime is 220416671. The reversal of 220416661 is 166614022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219217636 + 1199025 = 14806^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 220416661 - 2³ = 220416653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220416631) 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, 110208330 + 110208331.

It is an arithmetic number, because the mean of its divisors is an integer number (110208331).

Almost surely, 2^220416661 is an apocalyptic number.

It is an amenable number.

220416661 is a deficient number, since it is larger than the sum of its proper divisors (1).

220416661 is an equidigital number, since it uses as much as digits as its factorization.

220416661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 220416661 is about 14846.4359696191. The cubic root of 220416661 is about 604.0619399441.

The spelling of 220416661 in words is "two hundred twenty million, four hundred sixteen thousand, six hundred sixty-one".