12666051 has 10 divisors (see below), whose sum is σ = 18921012. Its totient is φ = 8443980.

The previous prime is 12666047. The next prime is 12666067. The reversal of 12666051 is 15066621.

It is a happy number.

It is not a de Polignac number, because 12666051 - 2² = 12666047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12666851) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78105 + ... + 78266.

Almost surely, 2^12666051 is an apocalyptic number.

12666051 is a deficient number, since it is larger than the sum of its proper divisors (6254961).

12666051 is an equidigital number, since it uses as much as digits as its factorization.

12666051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156383 (or 156374 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12666051 is about 3558.9395892597. The cubic root of 12666051 is about 233.1025784463.

The spelling of 12666051 in words is "twelve million, six hundred sixty-six thousand, fifty-one".