220566644 has 6 divisors (see below), whose sum is σ = 385991634. Its totient is φ = 110283320.

The previous prime is 220566601. The next prime is 220566659. The reversal of 220566644 is 446665022.

It can be written as a sum of positive squares in only one way, i.e., 112614544 + 107952100 = 10612^2 + 10390^2 .

It is a congruent number.

It is an unprimeable number.

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, 27570827 + ... + 27570834.

It is an arithmetic number, because the mean of its divisors is an integer number (64331939).

Almost surely, 2^220566644 is an apocalyptic number.

It is an amenable number.

220566644 is a deficient number, since it is larger than the sum of its proper divisors (165424990).

220566644 is a wasteful number, since it uses less digits than its factorization.

220566644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55141665 (or 55141663 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 220566644 is about 14851.4862555907. The cubic root of 220566644 is about 604.1989206361.

The spelling of 220566644 in words is "two hundred twenty million, five hundred sixty-six thousand, six hundred forty-four".