6444557568 has 54 divisors (see below), whose sum is σ = 18581254874. Its totient is φ = 2148185088.

The previous prime is 6444557563. The next prime is 6444557573. The reversal of 6444557568 is 8657554446.

6444557568 is a `hidden beast` number, since 6 + 4 + 4 + 4 + 5 + 575 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (6444557563) and next prime (6444557573).

It can be written as a sum of positive squares in only one way, i.e., 4917936384 + 1526621184 = 70128^2 + 39072^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444557563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1396255 + ... + 1400862.

Almost surely, 2^6444557568 is an apocalyptic number.

It is an amenable number.

6444557568 is an abundant number, since it is smaller than the sum of its proper divisors (12136697306).

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

6444557568 is a wasteful number, since it uses less digits than its factorization.

6444557568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797139 (or 2797122 counting only the distinct ones).

The product of its digits is 16128000, while the sum is 54.

The square root of 6444557568 is about 80278.0017688532. The cubic root of 6444557568 is about 1860.9342791583.

The spelling of 6444557568 in words is "six billion, four hundred forty-four million, five hundred fifty-seven thousand, five hundred sixty-eight".