64440046243 has 4 divisors (see below), whose sum is σ = 67241787408. Its totient is φ = 61638305080.

The previous prime is 64440046213. The next prime is 64440046247. The reversal of 64440046243 is 34264004446.

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 64440046243 - 2⁹ = 64440045731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64440046247) 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, 1400870548 + ... + 1400870593.

It is an arithmetic number, because the mean of its divisors is an integer number (16810446852).

Almost surely, 2^64440046243 is an apocalyptic number.

64440046243 is a deficient number, since it is larger than the sum of its proper divisors (2801741165).

64440046243 is a wasteful number, since it uses less digits than its factorization.

64440046243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801741164.

The product of its (nonzero) digits is 221184, while the sum is 37.

The spelling of 64440046243 in words is "sixty-four billion, four hundred forty million, forty-six thousand, two hundred forty-three".