12307666581 has 30 divisors (see below), whose sum is σ = 21387252150. Its totient is φ = 7032950064.

The previous prime is 12307666559. The next prime is 12307666619. The reversal of 12307666581 is 18566670321.

12307666581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10390540356 + 1917126225 = 101934^2 + 43785^2 .

It is not a de Polignac number, because 12307666581 - 2⁶ = 12307666517 is a prime.

It is a super-2 number, since 2×12307666581² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12307666981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1546506 + ... + 1554443.

It is an arithmetic number, because the mean of its divisors is an integer number (712908405).

Almost surely, 2^12307666581 is an apocalyptic number.

It is an amenable number.

12307666581 is a deficient number, since it is larger than the sum of its proper divisors (9079585569).

12307666581 is an equidigital number, since it uses as much as digits as its factorization.

12307666581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100975 (or 3100959 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 12307666581 in words is "twelve billion, three hundred seven million, six hundred sixty-six thousand, five hundred eighty-one".