220865506949 has 2 divisors, whose sum is σ = 220865506950. Its totient is φ = 220865506948.

The previous prime is 220865506943. The next prime is 220865507003. The reversal of 220865506949 is 949605568022.

220865506949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158093712100 + 62771794849 = 397610^2 + 250543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220865506949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220865506894 and 220865506903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220865506943) 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, 110432753474 + 110432753475.

It is an arithmetic number, because the mean of its divisors is an integer number (110432753475).

Almost surely, 2^220865506949 is an apocalyptic number.

It is an amenable number.

220865506949 is a deficient number, since it is larger than the sum of its proper divisors (1).

220865506949 is an equidigital number, since it uses as much as digits as its factorization.

220865506949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 220865506949 in words is "two hundred twenty billion, eight hundred sixty-five million, five hundred six thousand, nine hundred forty-nine".