220685776109 has 2 divisors, whose sum is σ = 220685776110. Its totient is φ = 220685776108.

The previous prime is 220685776061. The next prime is 220685776127. The reversal of 220685776109 is 901677586022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219407928100 + 1277848009 = 468410^2 + 35747^2 .

It is a cyclic number.

It is not a de Polignac number, because 220685776109 - 2²⁸ = 220417340653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220685776139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110342888054 + 110342888055.

It is an arithmetic number, because the mean of its divisors is an integer number (110342888055).

Almost surely, 2^220685776109 is an apocalyptic number.

It is an amenable number.

220685776109 is a deficient number, since it is larger than the sum of its proper divisors (1).

220685776109 is an equidigital number, since it uses as much as digits as its factorization.

220685776109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 220685776109 in words is "two hundred twenty billion, six hundred eighty-five million, seven hundred seventy-six thousand, one hundred nine".