12751666 has 8 divisors (see below), whose sum is σ = 20252700. Its totient is φ = 6000768.

The previous prime is 12751663. The next prime is 12751667. The reversal of 12751666 is 66615721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12425625 + 326041 = 3525^2 + 571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 375049 = 12751666 / (1 + 2 + 7 + 5 + 1 + 6 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (12751663) 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, 187491 + ... + 187558.

Almost surely, 2^12751666 is an apocalyptic number.

12751666 is a deficient number, since it is larger than the sum of its proper divisors (7501034).

12751666 is a wasteful number, since it uses less digits than its factorization.

12751666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375068.

The product of its digits is 15120, while the sum is 34.

The square root of 12751666 is about 3570.9474933132. The cubic root of 12751666 is about 233.6266112683.

The spelling of 12751666 in words is "twelve million, seven hundred fifty-one thousand, six hundred sixty-six".