123406165567 has 4 divisors (see below), whose sum is σ = 124678394176. Its totient is φ = 122133936960.

The previous prime is 123406165543. The next prime is 123406165577. The reversal of 123406165567 is 765561604321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123406165567 - 2²⁷ = 123271947839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123406165577) 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, 636114159 + ... + 636114352.

It is an arithmetic number, because the mean of its divisors is an integer number (31169598544).

Almost surely, 2^123406165567 is an apocalyptic number.

123406165567 is a deficient number, since it is larger than the sum of its proper divisors (1272228609).

123406165567 is an equidigital number, since it uses as much as digits as its factorization.

123406165567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272228608.

The product of its (nonzero) digits is 907200, while the sum is 46.

Adding to 123406165567 its reverse (765561604321), we get a palindrome (888967769888).

The spelling of 123406165567 in words is "one hundred twenty-three billion, four hundred six million, one hundred sixty-five thousand, five hundred sixty-seven".