123206220643 has 16 divisors (see below), whose sum is σ = 139074370560. Its totient is φ = 108117828000.

The previous prime is 123206220583. The next prime is 123206220659. The reversal of 123206220643 is 346022602321.

It is a cyclic number.

It is not a de Polignac number, because 123206220643 - 2³³ = 114616286051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123206220673) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1375168 + ... + 1462018.

It is an arithmetic number, because the mean of its divisors is an integer number (8692148160).

Almost surely, 2^123206220643 is an apocalyptic number.

123206220643 is a deficient number, since it is larger than the sum of its proper divisors (15868149917).

123206220643 is a wasteful number, since it uses less digits than its factorization.

123206220643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91338.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 123206220643 its reverse (346022602321), we get a palindrome (469228822964).

The spelling of 123206220643 in words is "one hundred twenty-three billion, two hundred six million, two hundred twenty thousand, six hundred forty-three".