220644620646 has 16 divisors (see below), whose sum is σ = 441296087808. Its totient is φ = 73547065800.

The previous prime is 220644620587. The next prime is 220644620683. The reversal of 220644620646 is 646026446022.

It is a junction number, because it is equal to n+sod(n) for n = 220644620598 and 220644620607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196191 + ... + 692661.

It is an arithmetic number, because the mean of its divisors is an integer number (27581005488).

Almost surely, 2^220644620646 is an apocalyptic number.

220644620646 is an abundant number, since it is smaller than the sum of its proper divisors (220651467162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220644620646 is a wasteful number, since it uses less digits than its factorization.

220644620646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570547.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 220644620646 in words is "two hundred twenty billion, six hundred forty-four million, six hundred twenty thousand, six hundred forty-six".