64865443823 has 4 divisors (see below), whose sum is σ = 64869135120. Its totient is φ = 64861752528.

The previous prime is 64865443787. The next prime is 64865443837. The reversal of 64865443823 is 32834456846.

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

It is a cyclic number.

It is not a de Polignac number, because 64865443823 - 2²⁰ = 64864395247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64865443883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819163 + ... + 1854476.

It is an arithmetic number, because the mean of its divisors is an integer number (16217283780).

Almost surely, 2^64865443823 is an apocalyptic number.

64865443823 is a deficient number, since it is larger than the sum of its proper divisors (3691297).

64865443823 is a wasteful number, since it uses less digits than its factorization.

64865443823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691296.

The product of its digits is 13271040, while the sum is 53.

The spelling of 64865443823 in words is "sixty-four billion, eight hundred sixty-five million, four hundred forty-three thousand, eight hundred twenty-three".