65640343 has 2 divisors, whose sum is σ = 65640344. Its totient is φ = 65640342.

The previous prime is 65640319. The next prime is 65640431. The reversal of 65640343 is 34304656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65640343 - 2¹⁷ = 65509271 is a prime.

It is equal to p_3876133 and since 65640343 and 3876133 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65640143) 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, 32820171 + 32820172.

It is an arithmetic number, because the mean of its divisors is an integer number (32820172).

Almost surely, 2^65640343 is an apocalyptic number.

65640343 is a deficient number, since it is larger than the sum of its proper divisors (1).

65640343 is an equidigital number, since it uses as much as digits as its factorization.

65640343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 65640343 is about 8101.8728081845. The cubic root of 65640343 is about 403.3885937687.

Adding to 65640343 its reverse (34304656), we get a palindrome (99944999).

The spelling of 65640343 in words is "sixty-five million, six hundred forty thousand, three hundred forty-three".