12660157 has 2 divisors, whose sum is σ = 12660158. Its totient is φ = 12660156.

The previous prime is 12660139. The next prime is 12660169. The reversal of 12660157 is 75106621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12630916 + 29241 = 3554^2 + 171^2 .

It is an emirp because it is prime and its reverse (75106621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12660157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12660107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330078 + 6330079.

It is an arithmetic number, because the mean of its divisors is an integer number (6330079).

Almost surely, 2^12660157 is an apocalyptic number.

It is an amenable number.

12660157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12660157 is an equidigital number, since it uses as much as digits as its factorization.

12660157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 12660157 is about 3558.1114372656. Note that the first 3 decimals coincide. The cubic root of 12660157 is about 233.0664156422.

Adding to 12660157 its reverse (75106621), we get a palindrome (87766778).

The spelling of 12660157 in words is "twelve million, six hundred sixty thousand, one hundred fifty-seven".