6610690561 has 2 divisors, whose sum is σ = 6610690562. Its totient is φ = 6610690560.

The previous prime is 6610690549. The next prime is 6610690571. The reversal of 6610690561 is 1650960166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5782689936 + 828000625 = 76044^2 + 28775^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610690561 - 2¹⁹ = 6610166273 is a prime.

It is not a weakly prime, because it can be changed into another prime (6610690571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305345280 + 3305345281.

It is an arithmetic number, because the mean of its divisors is an integer number (3305345281).

Almost surely, 2^6610690561 is an apocalyptic number.

It is an amenable number.

6610690561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6610690561 is an equidigital number, since it uses as much as digits as its factorization.

6610690561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 6610690561 is about 81306.1532788263. The cubic root of 6610690561 is about 1876.7896925294.

The spelling of 6610690561 in words is "six billion, six hundred ten million, six hundred ninety thousand, five hundred sixty-one".