64651823 has 2 divisors, whose sum is σ = 64651824. Its totient is φ = 64651822.

The previous prime is 64651801. The next prime is 64651841. The reversal of 64651823 is 32815646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64651823 - 2¹⁰ = 64650799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64651883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325911 + 32325912.

It is an arithmetic number, because the mean of its divisors is an integer number (32325912).

Almost surely, 2^64651823 is an apocalyptic number.

64651823 is a deficient number, since it is larger than the sum of its proper divisors (1).

64651823 is an equidigital number, since it uses as much as digits as its factorization.

64651823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 64651823 is about 8040.6357335723. The cubic root of 64651823 is about 401.3533803232.

The spelling of 64651823 in words is "sixty-four million, six hundred fifty-one thousand, eight hundred twenty-three".