220646977 has 2 divisors, whose sum is σ = 220646978. Its totient is φ = 220646976.

The previous prime is 220646971. The next prime is 220646989. The reversal of 220646977 is 779646022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156150016 + 64496961 = 12496^2 + 8031^2 .

It is a cyclic number.

It is not a de Polignac number, because 220646977 - 2⁷ = 220646849 is a prime.

It is not a weakly prime, because it can be changed into another prime (220646971) 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, 110323488 + 110323489.

It is an arithmetic number, because the mean of its divisors is an integer number (110323489).

Almost surely, 2^220646977 is an apocalyptic number.

It is an amenable number.

220646977 is a deficient number, since it is larger than the sum of its proper divisors (1).

220646977 is an equidigital number, since it uses as much as digits as its factorization.

220646977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 220646977 is about 14854.1905535105. The cubic root of 220646977 is about 604.2722638815.

The spelling of 220646977 in words is "two hundred twenty million, six hundred forty-six thousand, nine hundred seventy-seven".