12399775965605 has 8 divisors (see below), whose sum is σ = 17005407038592. Its totient is φ = 8502703519248.

The previous prime is 12399775965601. The next prime is 12399775965607. The reversal of 12399775965605 is 50656957799321.

12399775965605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12399775965605 - 2² = 12399775965601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12399775965601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177139656617 + ... + 177139656686.

It is an arithmetic number, because the mean of its divisors is an integer number (2125675879824).

Almost surely, 2^{12399775965605} is an apocalyptic number.

It is an amenable number.

12399775965605 is a deficient number, since it is larger than the sum of its proper divisors (4605631072987).

12399775965605 is an equidigital number, since it uses as much as digits as its factorization.

12399775965605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354279313315.

The product of its (nonzero) digits is 964467000, while the sum is 74.

The spelling of 12399775965605 in words is "twelve trillion, three hundred ninety-nine billion, seven hundred seventy-five million, nine hundred sixty-five thousand, six hundred five".