12312288666 has 24 divisors (see below), whose sum is σ = 26780435604. Its totient is φ = 4088125440.

The previous prime is 12312288647. The next prime is 12312288713. The reversal of 12312288666 is 66688221321.

It can be written as a sum of positive squares in 2 ways, for example, as 10841182641 + 1471106025 = 104121^2 + 38355^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1326145 + ... + 1335396.

Almost surely, 2^12312288666 is an apocalyptic number.

12312288666 is an abundant number, since it is smaller than the sum of its proper divisors (14468146938).

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

12312288666 is a wasteful number, since it uses less digits than its factorization.

12312288666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661806 (or 2661803 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 12312288666 in words is "twelve billion, three hundred twelve million, two hundred eighty-eight thousand, six hundred sixty-six".