123643332811 has 4 divisors (see below), whose sum is σ = 123644389000. Its totient is φ = 123642276624.

The previous prime is 123643332793. The next prime is 123643332833. The reversal of 123643332811 is 118233346321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 118233346321 = 593 ⋅199381697.

It is a cyclic number.

It is not a de Polignac number, because 123643332811 - 2⁵ = 123643332779 is a prime.

It is a super-2 number, since 2×123643332811² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123643332611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326961 + ... + 595138.

It is an arithmetic number, because the mean of its divisors is an integer number (30911097250).

Almost surely, 2^123643332811 is an apocalyptic number.

123643332811 is a deficient number, since it is larger than the sum of its proper divisors (1056189).

123643332811 is an equidigital number, since it uses as much as digits as its factorization.

123643332811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056188.

The product of its digits is 62208, while the sum is 37.

The spelling of 123643332811 in words is "one hundred twenty-three billion, six hundred forty-three million, three hundred thirty-two thousand, eight hundred eleven".