6646475861776 has 15 divisors (see below), whose sum is σ = 12877566962311. Its totient is φ = 3323232774736.

The previous prime is 6646475861771. The next prime is 6646475861777. The reversal of 6646475861776 is 6771685746466.

The square root of 6646475861776 is 2578076.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6646475861699 and 6646475861708.

It is not an unprimeable number, because it can be changed into a prime (6646475861771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9990045 + ... + 10634563.

Almost surely, 2^{6646475861776} is an apocalyptic number.

6646475861776 is the 2578076-th square number.

It is an amenable number.

6646475861776 is a deficient number, since it is larger than the sum of its proper divisors (6231091100535).

6646475861776 is an frugal number, since it uses more digits than its factorization.

6646475861776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289046 (or 644521 counting only the distinct ones).

The product of its digits is 1706987520, while the sum is 73.

The spelling of 6646475861776 in words is "six trillion, six hundred forty-six billion, four hundred seventy-five million, eight hundred sixty-one thousand, seven hundred seventy-six".