666624241 has 2 divisors, whose sum is σ = 666624242. Its totient is φ = 666624240.

The previous prime is 666624229. The next prime is 666624251. The reversal of 666624241 is 142426666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600446016 + 66178225 = 24504^2 + 8135^2 .

It is a cyclic number.

It is not a de Polignac number, because 666624241 - 2⁵ = 666624209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666624241.

It is not a weakly prime, because it can be changed into another prime (666624251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333312120 + 333312121.

It is an arithmetic number, because the mean of its divisors is an integer number (333312121).

Almost surely, 2^666624241 is an apocalyptic number.

It is an amenable number.

666624241 is a deficient number, since it is larger than the sum of its proper divisors (1).

666624241 is an equidigital number, since it uses as much as digits as its factorization.

666624241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 37.

The square root of 666624241 is about 25819.0673921426. The cubic root of 666624241 is about 873.5619332264.

The spelling of 666624241 in words is "six hundred sixty-six million, six hundred twenty-four thousand, two hundred forty-one".