12123523616 has 48 divisors (see below), whose sum is σ = 25288603704. Its totient is φ = 5701484544.

The previous prime is 12123523549. The next prime is 12123523627. The reversal of 12123523616 is 61632532121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11223283600 + 900240016 = 105940^2 + 30004^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947276 + ... + 959988.

Almost surely, 2^12123523616 is an apocalyptic number.

12123523616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12123523616 is an abundant number, since it is smaller than the sum of its proper divisors (13165080088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12123523616 is a wasteful number, since it uses less digits than its factorization.

12123523616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14493 (or 14485 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The spelling of 12123523616 in words is "twelve billion, one hundred twenty-three million, five hundred twenty-three thousand, six hundred sixteen".