6544036668 has 24 divisors (see below), whose sum is σ = 16443989968. Its totient is φ = 2013549696.

The previous prime is 6544036621. The next prime is 6544036669. The reversal of 6544036668 is 8666304456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544036669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20974321 + ... + 20974632.

Almost surely, 2^6544036668 is an apocalyptic number.

It is an amenable number.

6544036668 is an abundant number, since it is smaller than the sum of its proper divisors (9899953300).

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

6544036668 is a wasteful number, since it uses less digits than its factorization.

6544036668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41948973 (or 41948971 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The square root of 6544036668 is about 80895.2203037979. The cubic root of 6544036668 is about 1870.4606439513.

The spelling of 6544036668 in words is "six billion, five hundred forty-four million, thirty-six thousand, six hundred sixty-eight".