6505201561 has 2 divisors, whose sum is σ = 6505201562. Its totient is φ = 6505201560.

The previous prime is 6505201559. The next prime is 6505201607. The reversal of 6505201561 is 1651025056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3292579161 + 3212622400 = 57381^2 + 56680^2 .

It is a cyclic number.

It is not a de Polignac number, because 6505201561 - 2¹ = 6505201559 is a prime.

Together with 6505201559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6505201061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3252600780 + 3252600781.

It is an arithmetic number, because the mean of its divisors is an integer number (3252600781).

Almost surely, 2^6505201561 is an apocalyptic number.

It is an amenable number.

6505201561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6505201561 is an equidigital number, since it uses as much as digits as its factorization.

6505201561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 6505201561 is about 80654.8297437915. The cubic root of 6505201561 is about 1866.7532632268.

The spelling of 6505201561 in words is "six billion, five hundred five million, two hundred one thousand, five hundred sixty-one".