6560040521 has 2 divisors, whose sum is σ = 6560040522. Its totient is φ = 6560040520.

The previous prime is 6560040499. The next prime is 6560040523. The reversal of 6560040521 is 1250400656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3556452496 + 3003588025 = 59636^2 + 54805^2 .

It is a cyclic number.

It is not a de Polignac number, because 6560040521 - 2¹⁴ = 6560024137 is a prime.

Together with 6560040523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6560040523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280020260 + 3280020261.

It is an arithmetic number, because the mean of its divisors is an integer number (3280020261).

Almost surely, 2^6560040521 is an apocalyptic number.

It is an amenable number.

6560040521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6560040521 is an equidigital number, since it uses as much as digits as its factorization.

6560040521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 6560040521 is about 80994.0770735737. The cubic root of 6560040521 is about 1871.9841790164.

The spelling of 6560040521 in words is "six billion, five hundred sixty million, forty thousand, five hundred twenty-one".