220658681 has 2 divisors, whose sum is σ = 220658682. Its totient is φ = 220658680.

The previous prime is 220658629. The next prime is 220658693. The reversal of 220658681 is 186856022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196560400 + 24098281 = 14020^2 + 4909^2 .

It is a cyclic number.

It is not a de Polignac number, because 220658681 - 2⁶ = 220658617 is a prime.

It is a super-2 number, since 2×220658681² = 97380507001319522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220658881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110329340 + 110329341.

It is an arithmetic number, because the mean of its divisors is an integer number (110329341).

Almost surely, 2^220658681 is an apocalyptic number.

It is an amenable number.

220658681 is a deficient number, since it is larger than the sum of its proper divisors (1).

220658681 is an equidigital number, since it uses as much as digits as its factorization.

220658681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 220658681 is about 14854.5845111871. The cubic root of 220658681 is about 604.2829480335.

The spelling of 220658681 in words is "two hundred twenty million, six hundred fifty-eight thousand, six hundred eighty-one".