64665823 has 2 divisors, whose sum is σ = 64665824. Its totient is φ = 64665822.

The previous prime is 64665817. The next prime is 64665827. The reversal of 64665823 is 32856646.

It is a happy number.

64665823 is nontrivially palindromic in base 3.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64665823 - 2¹³ = 64657631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64665827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332911 + 32332912.

It is an arithmetic number, because the mean of its divisors is an integer number (32332912).

Almost surely, 2^64665823 is an apocalyptic number.

64665823 is a deficient number, since it is larger than the sum of its proper divisors (1).

64665823 is an equidigital number, since it uses as much as digits as its factorization.

64665823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 40.

The square root of 64665823 is about 8041.5062643761. The cubic root of 64665823 is about 401.3823485282.

The spelling of 64665823 in words is "sixty-four million, six hundred sixty-five thousand, eight hundred twenty-three".