64423344646 has 4 divisors (see below), whose sum is σ = 96635016972. Its totient is φ = 32211672322.

The previous prime is 64423344641. The next prime is 64423344673. The reversal of 64423344646 is 64644332446.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 64423344596 and 64423344605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64423344641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16105836160 + ... + 16105836163.

It is an arithmetic number, because the mean of its divisors is an integer number (24158754243).

Almost surely, 2^64423344646 is an apocalyptic number.

64423344646 is a deficient number, since it is larger than the sum of its proper divisors (32211672326).

64423344646 is a wasteful number, since it uses less digits than its factorization.

64423344646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32211672325.

The product of its digits is 3981312, while the sum is 46.

The spelling of 64423344646 in words is "sixty-four billion, four hundred twenty-three million, three hundred forty-four thousand, six hundred forty-six".