6520619937680 has 80 divisors (see below), whose sum is σ = 15203085534000. Its totient is φ = 2600914606080.

The previous prime is 6520619937677. The next prime is 6520619937683. The reversal of 6520619937680 is 867399160256.

It is an interprime number because it is at equal distance from previous prime (6520619937677) and next prime (6520619937683).

It can be written as a sum of positive squares in 8 ways, for example, as 772057454224 + 5748562483456 = 878668^2 + 2397616^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6520619937683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141541850 + ... + 141587910.

It is an arithmetic number, because the mean of its divisors is an integer number (190038569175).

Almost surely, 2^{6520619937680} is an apocalyptic number.

It is an amenable number.

6520619937680 is an abundant number, since it is smaller than the sum of its proper divisors (8682465596320).

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

6520619937680 is a wasteful number, since it uses less digits than its factorization.

6520619937680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51012 (or 51006 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 6520619937680 in words is "six trillion, five hundred twenty billion, six hundred nineteen million, nine hundred thirty-seven thousand, six hundred eighty".