220643432666 has 32 divisors (see below), whose sum is σ = 351518449152. Its totient is φ = 103686972480.

The previous prime is 220643432567. The next prime is 220643432671. The reversal of 220643432666 is 666234346022.

220643432666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166900 + ... + 1342736.

It is an arithmetic number, because the mean of its divisors is an integer number (10984951536).

Almost surely, 2^220643432666 is an apocalyptic number.

220643432666 is a deficient number, since it is larger than the sum of its proper divisors (130875016486).

220643432666 is a wasteful number, since it uses less digits than its factorization.

220643432666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176454.

The product of its (nonzero) digits is 1492992, while the sum is 44.

Adding to 220643432666 its reverse (666234346022), we get a palindrome (886877778688).

The spelling of 220643432666 in words is "two hundred twenty billion, six hundred forty-three million, four hundred thirty-two thousand, six hundred sixty-six".