220985855977 has 2 divisors, whose sum is σ = 220985855978. Its totient is φ = 220985855976.

The previous prime is 220985855971. The next prime is 220985856001. The reversal of 220985855977 is 779558589022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215868027456 + 5117828521 = 464616^2 + 71539^2 .

It is a cyclic number.

It is not a de Polignac number, because 220985855977 - 2¹¹ = 220985853929 is a prime.

It is not a weakly prime, because it can be changed into another prime (220985855971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110492927988 + 110492927989.

It is an arithmetic number, because the mean of its divisors is an integer number (110492927989).

Almost surely, 2^220985855977 is an apocalyptic number.

It is an amenable number.

220985855977 is a deficient number, since it is larger than the sum of its proper divisors (1).

220985855977 is an equidigital number, since it uses as much as digits as its factorization.

220985855977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008000, while the sum is 67.

The spelling of 220985855977 in words is "two hundred twenty billion, nine hundred eighty-five million, eight hundred fifty-five thousand, nine hundred seventy-seven".