220668001 has 2 divisors, whose sum is σ = 220668002. Its totient is φ = 220668000.

The previous prime is 220667999. The next prime is 220668011. The reversal of 220668001 is 100866022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212459776 + 8208225 = 14576^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 220668001 - 2¹ = 220667999 is a prime.

Together with 220667999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (220668011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110334000 + 110334001.

It is an arithmetic number, because the mean of its divisors is an integer number (110334001).

Almost surely, 2^220668001 is an apocalyptic number.

It is an amenable number.

220668001 is a deficient number, since it is larger than the sum of its proper divisors (1).

220668001 is an equidigital number, since it uses as much as digits as its factorization.

220668001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 220668001 is about 14854.8982157402. The cubic root of 220668001 is about 604.2914556492.

It can be divided in two parts, 2206 and 68001, that added together give a palindrome (70207).

The spelling of 220668001 in words is "two hundred twenty million, six hundred sixty-eight thousand, one".