6521979760 has 20 divisors (see below), whose sum is σ = 15163603128. Its totient is φ = 2608791872.

The previous prime is 6521979749. The next prime is 6521979787. The reversal of 6521979760 is 679791256.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 6521979698 and 6521979707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40762294 + ... + 40762453.

Almost surely, 2^6521979760 is an apocalyptic number.

It is an amenable number.

6521979760 is an abundant number, since it is smaller than the sum of its proper divisors (8641623368).

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

6521979760 is a wasteful number, since it uses less digits than its factorization.

6521979760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81524760 (or 81524754 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 52.

The square root of 6521979760 is about 80758.7751269173. The cubic root of 6521979760 is about 1868.3567938008.

The spelling of 6521979760 in words is "six billion, five hundred twenty-one million, nine hundred seventy-nine thousand, seven hundred sixty".