666552137 has 2 divisors, whose sum is σ = 666552138. Its totient is φ = 666552136.

The previous prime is 666552109. The next prime is 666552149. The reversal of 666552137 is 731255666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662753536 + 3798601 = 25744^2 + 1949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666552137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666552094 and 666552103.

It is not a weakly prime, because it can be changed into another prime (666552437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333276068 + 333276069.

It is an arithmetic number, because the mean of its divisors is an integer number (333276069).

Almost surely, 2^666552137 is an apocalyptic number.

It is an amenable number.

666552137 is a deficient number, since it is larger than the sum of its proper divisors (1).

666552137 is an equidigital number, since it uses as much as digits as its factorization.

666552137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 666552137 is about 25817.6710219958. The cubic root of 666552137 is about 873.5304364316.

The spelling of 666552137 in words is "six hundred sixty-six million, five hundred fifty-two thousand, one hundred thirty-seven".