123684479522 has 18 divisors (see below), whose sum is σ = 186892200243. Its totient is φ = 61390386384.

The previous prime is 123684479509. The next prime is 123684479563. The reversal of 123684479522 is 225974486321.

It can be written as a sum of positive squares in 5 ways, for example, as 17257814161 + 106426665361 = 131369^2 + 326231^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=248681.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 74106104 + ... + 74107772.

Almost surely, 2^123684479522 is an apocalyptic number.

123684479522 is a deficient number, since it is larger than the sum of its proper divisors (63207720721).

123684479522 is an frugal number, since it uses more digits than its factorization.

123684479522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638 (or 1820 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The spelling of 123684479522 in words is "one hundred twenty-three billion, six hundred eighty-four million, four hundred seventy-nine thousand, five hundred twenty-two".