12945436605 has 80 divisors (see below), whose sum is σ = 23963157504. Its totient is φ = 6680983680.

The previous prime is 12945436591. The next prime is 12945436627. The reversal of 12945436605 is 50663454921.

12945436605 is a `hidden beast` number, since 1 + 2 + 9 + 4 + 5 + 4 + 36 + 605 = 666.

It is not a de Polignac number, because 12945436605 - 2⁴ = 12945436589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2859874 + ... + 2864396.

Almost surely, 2^12945436605 is an apocalyptic number.

12945436605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12945436605 is a deficient number, since it is larger than the sum of its proper divisors (11017720899).

12945436605 is a wasteful number, since it uses less digits than its factorization.

12945436605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768 (or 4759 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 12945436605 in words is "twelve billion, nine hundred forty-five million, four hundred thirty-six thousand, six hundred five".