6440322566 has 16 divisors (see below), whose sum is σ = 9770725440. Its totient is φ = 3183486720.

The previous prime is 6440322541. The next prime is 6440322583. The reversal of 6440322566 is 6652230446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164915 + ... + 200193.

It is an arithmetic number, because the mean of its divisors is an integer number (610670340).

Almost surely, 2^6440322566 is an apocalyptic number.

6440322566 is a deficient number, since it is larger than the sum of its proper divisors (3330402874).

6440322566 is a wasteful number, since it uses less digits than its factorization.

6440322566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36319.

The product of its (nonzero) digits is 207360, while the sum is 38.

The square root of 6440322566 is about 80251.6203325515. The cubic root of 6440322566 is about 1860.5265559349.

The spelling of 6440322566 in words is "six billion, four hundred forty million, three hundred twenty-two thousand, five hundred sixty-six".