667255649 has 2 divisors, whose sum is σ = 667255650. Its totient is φ = 667255648.

The previous prime is 667255601. The next prime is 667255679. The reversal of 667255649 is 946552766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666001249 + 1254400 = 25807^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667255649 is a prime.

It is a super-2 number, since 2×667255649² = 890460202244822402, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 667255597 and 667255606.

It is not a weakly prime, because it can be changed into another prime (667255679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333627824 + 333627825.

It is an arithmetic number, because the mean of its divisors is an integer number (333627825).

Almost surely, 2^667255649 is an apocalyptic number.

It is an amenable number.

667255649 is a deficient number, since it is larger than the sum of its proper divisors (1).

667255649 is an equidigital number, since it uses as much as digits as its factorization.

667255649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 50.

The square root of 667255649 is about 25831.2920505344. The cubic root of 667255649 is about 873.8376507424.

The spelling of 667255649 in words is "six hundred sixty-seven million, two hundred fifty-five thousand, six hundred forty-nine".