6440016544 has 48 divisors (see below), whose sum is σ = 14124930120. Its totient is φ = 2869816320.

The previous prime is 6440016533. The next prime is 6440016553. The reversal of 6440016544 is 4456100446.

It can be written as a sum of positive squares in 4 ways, for example, as 5477776144 + 962240400 = 74012^2 + 31020^2 .

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, 254847 + ... + 278974.

Almost surely, 2^6440016544 is an apocalyptic number.

It is an amenable number.

6440016544 is an abundant number, since it is smaller than the sum of its proper divisors (7684913576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440016544 is a wasteful number, since it uses less digits than its factorization.

6440016544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533873 (or 533865 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 6440016544 is about 80249.7136692711. The cubic root of 6440016544 is about 1860.4970868583.

The spelling of 6440016544 in words is "six billion, four hundred forty million, sixteen thousand, five hundred forty-four".