6605858561 has 2 divisors, whose sum is σ = 6605858562. Its totient is φ = 6605858560.

The previous prime is 6605858557. The next prime is 6605858587. The reversal of 6605858561 is 1658585066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5910534400 + 695324161 = 76880^2 + 26369^2 .

It is a cyclic number.

It is not a de Polignac number, because 6605858561 - 2² = 6605858557 is a prime.

It is not a weakly prime, because it can be changed into another prime (6605858461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3302929280 + 3302929281.

It is an arithmetic number, because the mean of its divisors is an integer number (3302929281).

Almost surely, 2^6605858561 is an apocalyptic number.

It is an amenable number.

6605858561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6605858561 is an equidigital number, since it uses as much as digits as its factorization.

6605858561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 50.

The square root of 6605858561 is about 81276.4329987482. The cubic root of 6605858561 is about 1876.3323092376.

The spelling of 6605858561 in words is "six billion, six hundred five million, eight hundred fifty-eight thousand, five hundred sixty-one".