6544766646 has 24 divisors (see below), whose sum is σ = 15469448904. Its totient is φ = 1983262560.

The previous prime is 6544766623. The next prime is 6544766729. The reversal of 6544766646 is 6466674456.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6544766592 and 6544766601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16526991 + ... + 16527386.

It is an arithmetic number, because the mean of its divisors is an integer number (644560371).

Almost surely, 2^6544766646 is an apocalyptic number.

6544766646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6544766646 is an abundant number, since it is smaller than the sum of its proper divisors (8924682258).

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

6544766646 is a wasteful number, since it uses less digits than its factorization.

6544766646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33054396 (or 33054393 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 54.

The square root of 6544766646 is about 80899.7320514722. The cubic root of 6544766646 is about 1870.5301904419.

The spelling of 6544766646 in words is "six billion, five hundred forty-four million, seven hundred sixty-six thousand, six hundred forty-six".