6440562403243 has 4 divisors (see below), whose sum is σ = 6444425969640. Its totient is φ = 6436698836848.

The previous prime is 6440562403183. The next prime is 6440562403273. The reversal of 6440562403243 is 3423042650446.

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 6440562403243 - 2¹⁷ = 6440562272171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440562403243.

It is not an unprimeable number, because it can be changed into a prime (6440562403273) 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, 1931780698 + ... + 1931784031.

It is an arithmetic number, because the mean of its divisors is an integer number (1611106492410).

Almost surely, 2^{6440562403243} is an apocalyptic number.

6440562403243 is a deficient number, since it is larger than the sum of its proper divisors (3863566397).

6440562403243 is a wasteful number, since it uses less digits than its factorization.

6440562403243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863566396.

The product of its (nonzero) digits is 1658880, while the sum is 43.

The spelling of 6440562403243 in words is "six trillion, four hundred forty billion, five hundred sixty-two million, four hundred three thousand, two hundred forty-three".