665542343 has 2 divisors, whose sum is σ = 665542344. Its totient is φ = 665542342.

The previous prime is 665542331. The next prime is 665542349. The reversal of 665542343 is 343245566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665542343 - 2¹⁰ = 665541319 is a prime.

It is a super-2 number, since 2×665542343² = 885893220651859298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665542297 and 665542306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665542349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332771171 + 332771172.

It is an arithmetic number, because the mean of its divisors is an integer number (332771172).

Almost surely, 2^665542343 is an apocalyptic number.

665542343 is a deficient number, since it is larger than the sum of its proper divisors (1).

665542343 is an equidigital number, since it uses as much as digits as its factorization.

665542343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 38.

The square root of 665542343 is about 25798.1073530598. The cubic root of 665542343 is about 873.0890948076.

The spelling of 665542343 in words is "six hundred sixty-five million, five hundred forty-two thousand, three hundred forty-three".