6447768803 has 16 divisors (see below), whose sum is σ = 7499934720. Its totient is φ = 5428521600.

The previous prime is 6447768757. The next prime is 6447768809. The reversal of 6447768803 is 3088677446.

It is a Cunningham number, because it is equal to 80298²-1.

It is a cyclic number.

It is not a de Polignac number, because 6447768803 - 2⁶ = 6447768739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6447768809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556358 + ... + 567828.

It is an arithmetic number, because the mean of its divisors is an integer number (468745920).

Almost surely, 2^6447768803 is an apocalyptic number.

6447768803 is a deficient number, since it is larger than the sum of its proper divisors (1052165917).

6447768803 is a wasteful number, since it uses less digits than its factorization.

6447768803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12898.

The product of its (nonzero) digits is 5419008, while the sum is 53.

The square root of 6447768803 is about 80297.9999937732. Note that the first 5 decimals coincide. The cubic root of 6447768803 is about 1861.2433205436.

The spelling of 6447768803 in words is "six billion, four hundred forty-seven million, seven hundred sixty-eight thousand, eight hundred three".