6565543640 has 16 divisors (see below), whose sum is σ = 14772473280. Its totient is φ = 2626217440.

The previous prime is 6565543639. The next prime is 6565543657. The reversal of 6565543640 is 463455656.

It is a junction number, because it is equal to n+sod(n) for n = 6565543591 and 6565543600.

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, 82069256 + ... + 82069335.

It is an arithmetic number, because the mean of its divisors is an integer number (923279580).

Almost surely, 2^6565543640 is an apocalyptic number.

It is an amenable number.

6565543640 is an abundant number, since it is smaller than the sum of its proper divisors (8206929640).

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

6565543640 is a wasteful number, since it uses less digits than its factorization.

6565543640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164138602 (or 164138598 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 44.

The square root of 6565543640 is about 81028.0423063522. The cubic root of 6565543640 is about 1872.5074924700.

The spelling of 6565543640 in words is "six billion, five hundred sixty-five million, five hundred forty-three thousand, six hundred forty".