12661761 has 16 divisors (see below), whose sum is σ = 19353600. Its totient is φ = 7213008.

The previous prime is 12661741. The next prime is 12661769. The reversal of 12661761 is 16716621.

12661761 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12661761 - 2⁷ = 12661633 is a prime.

It is a super-2 number, since 2×12661761² = 320640383242242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12661769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8080 + ... + 9518.

It is an arithmetic number, because the mean of its divisors is an integer number (1209600).

Almost surely, 2^12661761 is an apocalyptic number.

It is an amenable number.

12661761 is a deficient number, since it is larger than the sum of its proper divisors (6691839).

12661761 is a wasteful number, since it uses less digits than its factorization.

12661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its digits is 3024, while the sum is 30.

The square root of 12661761 is about 3558.3368305994. The cubic root of 12661761 is about 233.0762581411.

The spelling of 12661761 in words is "twelve million, six hundred sixty-one thousand, seven hundred sixty-one".