12542666 has 4 divisors (see below), whose sum is σ = 18814002. Its totient is φ = 6271332.

The previous prime is 12542657. The next prime is 12542723. The reversal of 12542666 is 66624521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66624521 = 47 ⋅1417543.

It can be written as a sum of positive squares in only one way, i.e., 7155625 + 5387041 = 2675^2 + 2321^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3135665 + ... + 3135668.

Almost surely, 2^12542666 is an apocalyptic number.

12542666 is a deficient number, since it is larger than the sum of its proper divisors (6271336).

12542666 is an equidigital number, since it uses as much as digits as its factorization.

12542666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271335.

The product of its digits is 17280, while the sum is 32.

The square root of 12542666 is about 3541.5626494529. The cubic root of 12542666 is about 232.3431925283.

The spelling of 12542666 in words is "twelve million, five hundred forty-two thousand, six hundred sixty-six".