12666507 has 16 divisors (see below), whose sum is σ = 19924992. Its totient is φ = 7004160.

The previous prime is 12666503. The next prime is 12666517. The reversal of 12666507 is 70566621.

It is not a de Polignac number, because 12666507 - 2² = 12666503 is a prime.

It is a super-3 number, since 3×12666507³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12666503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9078 + ... + 10379.

It is an arithmetic number, because the mean of its divisors is an integer number (1245312).

Almost surely, 2^12666507 is an apocalyptic number.

12666507 is a deficient number, since it is larger than the sum of its proper divisors (7258485).

12666507 is a wasteful number, since it uses less digits than its factorization.

12666507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19498.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 12666507 is about 3559.0036527096. The cubic root of 12666507 is about 233.1053757796.

The spelling of 12666507 in words is "twelve million, six hundred sixty-six thousand, five hundred seven".