123673644505 has 8 divisors (see below), whose sum is σ = 157138277832. Its totient is φ = 93118979328.

The previous prime is 123673644469. The next prime is 123673644511. The reversal of 123673644505 is 505446376321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15401058201 + 108272586304 = 124101^2 + 329048^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123673644505 - 2⁷ = 123673644377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727491942 + ... + 727492111.

It is an arithmetic number, because the mean of its divisors is an integer number (19642284729).

Almost surely, 2^123673644505 is an apocalyptic number.

It is an amenable number.

123673644505 is a deficient number, since it is larger than the sum of its proper divisors (33464633327).

123673644505 is a wasteful number, since it uses less digits than its factorization.

123673644505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454984075.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 123673644505 in words is "one hundred twenty-three billion, six hundred seventy-three million, six hundred forty-four thousand, five hundred five".