220664497 has 8 divisors (see below), whose sum is σ = 223273512. Its totient is φ = 218064000.

The previous prime is 220664491. The next prime is 220664503. The reversal of 220664497 is 794466022.

It is an interprime number because it is at equal distance from previous prime (220664491) and next prime (220664503).

It can be written as a sum of positive squares in 4 ways, for example, as 24216241 + 196448256 = 4921^2 + 14016^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220664497 - 2¹⁹ = 220140209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220664491) 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 in 7 ways as a sum of consecutive naturals, for example, 60547 + ... + 64087.

It is an arithmetic number, because the mean of its divisors is an integer number (27909189).

Almost surely, 2^220664497 is an apocalyptic number.

It is an amenable number.

220664497 is a deficient number, since it is larger than the sum of its proper divisors (2609015).

220664497 is a wasteful number, since it uses less digits than its factorization.

220664497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 220664497 is about 14854.7802743763. The cubic root of 220664497 is about 604.2882571059.

The spelling of 220664497 in words is "two hundred twenty million, six hundred sixty-four thousand, four hundred ninety-seven".