6443225506 has 4 divisors (see below), whose sum is σ = 9664838262. Its totient is φ = 3221612752.

The previous prime is 6443225407. The next prime is 6443225507. The reversal of 6443225506 is 6055223446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6055223446 = 2 ⋅3027611723.

It can be written as a sum of positive squares in only one way, i.e., 5582331225 + 860894281 = 74715^2 + 29341^2 .

It is not an unprimeable number, because it can be changed into a prime (6443225507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610806375 + ... + 1610806378.

Almost surely, 2^6443225506 is an apocalyptic number.

6443225506 is a deficient number, since it is larger than the sum of its proper divisors (3221612756).

6443225506 is a wasteful number, since it uses less digits than its factorization.

6443225506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221612755.

The product of its (nonzero) digits is 172800, while the sum is 37.

The square root of 6443225506 is about 80269.7047833116. The cubic root of 6443225506 is about 1860.8060546514.

The spelling of 6443225506 in words is "six billion, four hundred forty-three million, two hundred twenty-five thousand, five hundred six".