6440223001 has 3 divisors (see below), whose sum is σ = 6440303253. Its totient is φ = 6440142750.

The previous prime is 6440222981. The next prime is 6440223007. The reversal of 6440223001 is 1003220446.

It is a happy number.

The square root of 6440223001 is 80251.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1003220446 = 2 ⋅501610223.

It is not a de Polignac number, because 6440223001 - 2²⁷ = 6306005273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440223007) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40126 + ... + 120376.

It is an arithmetic number, because the mean of its divisors is an integer number (2146767751).

Almost surely, 2^6440223001 is an apocalyptic number.

6440223001 is the 80251-st square number.

6440223001 is the 40126-th centered octagonal number.

It is an amenable number.

6440223001 is a deficient number, since it is larger than the sum of its proper divisors (80252).

6440223001 is an frugal number, since it uses more digits than its factorization.

6440223001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160502 (or 80251 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The cubic root of 6440223001 is about 1860.5169682018.

Adding to 6440223001 its reverse (1003220446), we get a palindrome (7443443447).

It can be divided in two parts, 6440 and 223001, that added together give a square (229441 = 479²).

The spelling of 6440223001 in words is "six billion, four hundred forty million, two hundred twenty-three thousand, one".