12045487717 has 4 divisors (see below), whose sum is σ = 12754045836. Its totient is φ = 11336929600.

The previous prime is 12045487697. The next prime is 12045487721. The reversal of 12045487717 is 71778454021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71778454021 = 7591 ⋅9455731.

It can be written as a sum of positive squares in 2 ways, for example, as 8835812001 + 3209675716 = 93999^2 + 56654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12045487717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12045487417) 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, 354279034 + ... + 354279067.

It is an arithmetic number, because the mean of its divisors is an integer number (3188511459).

Almost surely, 2^12045487717 is an apocalyptic number.

12045487717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12045487717 is a deficient number, since it is larger than the sum of its proper divisors (708558119).

12045487717 is an equidigital number, since it uses as much as digits as its factorization.

12045487717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708558118.

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 12045487717 in words is "twelve billion, forty-five million, four hundred eighty-seven thousand, seven hundred seventeen".