12315221554666 has 8 divisors (see below), whose sum is σ = 18473634138564. Its totient is φ = 6157343508480.

The previous prime is 12315221554663. The next prime is 12315221554759. The reversal of 12315221554666 is 66645512251321.

It can be written as a sum of positive squares in 2 ways, for example, as 12176784725625 + 138436829041 = 3489525^2 + 372071^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12315221554663) 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, 133576825 + ... + 133668988.

Almost surely, 2^{12315221554666} is an apocalyptic number.

12315221554666 is a deficient number, since it is larger than the sum of its proper divisors (6158412583898).

12315221554666 is a wasteful number, since it uses less digits than its factorization.

12315221554666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267268856.

The product of its digits is 2592000, while the sum is 49.

The spelling of 12315221554666 in words is "twelve trillion, three hundred fifteen billion, two hundred twenty-one million, five hundred fifty-four thousand, six hundred sixty-six".