65617823 has 2 divisors, whose sum is σ = 65617824. Its totient is φ = 65617822.

The previous prime is 65617819. The next prime is 65617829. The reversal of 65617823 is 32871656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65617823 - 2² = 65617819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65617829) 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, 32808911 + 32808912.

It is an arithmetic number, because the mean of its divisors is an integer number (32808912).

Almost surely, 2^65617823 is an apocalyptic number.

65617823 is a deficient number, since it is larger than the sum of its proper divisors (1).

65617823 is an equidigital number, since it uses as much as digits as its factorization.

65617823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 65617823 is about 8100.4828868408. The cubic root of 65617823 is about 403.3424567448.

The spelling of 65617823 in words is "sixty-five million, six hundred seventeen thousand, eight hundred twenty-three".