12661759 has 4 divisors (see below), whose sum is σ = 13812840. Its totient is φ = 11510680.

The previous prime is 12661741. The next prime is 12661769. The reversal of 12661759 is 95716621.

12661759 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12661759 - 2¹⁵ = 12628991 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 (12661739) 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, 575524 + ... + 575545.

It is an arithmetic number, because the mean of its divisors is an integer number (3453210).

Almost surely, 2^12661759 is an apocalyptic number.

12661759 is a deficient number, since it is larger than the sum of its proper divisors (1151081).

12661759 is a wasteful number, since it uses less digits than its factorization.

12661759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151080.

The product of its digits is 22680, while the sum is 37.

The square root of 12661759 is about 3558.3365495692. The cubic root of 12661759 is about 233.0762458691.

It can be divided in two parts, 1266 and 1759, that added together give a square (3025 = 55²).

The spelling of 12661759 in words is "twelve million, six hundred sixty-one thousand, seven hundred fifty-nine".