6506905680 has 360 divisors, whose sum is σ = 25290152160. Its totient is φ = 1494028800.

The previous prime is 6506905637. The next prime is 6506905681. The reversal of 6506905680 is 865096056.

6506905680 is a `hidden beast` number, since 6 + 506 + 90 + 56 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506905681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1653315 + ... + 1657245.

Almost surely, 2^6506905680 is an apocalyptic number.

6506905680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6506905680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12645076080).

6506905680 is an abundant number, since it is smaller than the sum of its proper divisors (18783246480).

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

6506905680 is a wasteful number, since it uses less digits than its factorization.

6506905680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991 (or 3971 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 6506905680 is about 80665.3933232833. The cubic root of 6506905680 is about 1866.9162554586.

The spelling of 6506905680 in words is "six billion, five hundred six million, nine hundred five thousand, six hundred eighty".