6506803440 has 80 divisors (see below), whose sum is σ = 22412330400. Its totient is φ = 1735147008.

The previous prime is 6506803421. The next prime is 6506803453. The reversal of 6506803440 is 443086056.

6506803440 is a `hidden beast` number, since 6 + 506 + 80 + 34 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6506803395 and 6506803404.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1504045 + ... + 1508364.

It is an arithmetic number, because the mean of its divisors is an integer number (280154130).

Almost surely, 2^6506803440 is an apocalyptic number.

6506803440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6506803440 is an abundant number, since it is smaller than the sum of its proper divisors (15905526960).

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

6506803440 is a wasteful number, since it uses less digits than its factorization.

6506803440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012431 (or 3012419 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 6506803440 is about 80664.7595917821. The cubic root of 6506803440 is about 1866.9064774101.

Adding to 6506803440 its reverse (443086056), we get a palindrome (6949889496).

The spelling of 6506803440 in words is "six billion, five hundred six million, eight hundred three thousand, four hundred forty".