10664561 has 2 divisors, whose sum is σ = 10664562. Its totient is φ = 10664560.

The previous prime is 10664519. The next prime is 10664581. The reversal of 10664561 is 16546601.

10664561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8814961 + 1849600 = 2969^2 + 1360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10664561 is a prime.

It is a super-2 number, since 2×10664561² = 227465722645442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10664581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332280 + 5332281.

It is an arithmetic number, because the mean of its divisors is an integer number (5332281).

Almost surely, 2^10664561 is an apocalyptic number.

It is an amenable number.

10664561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10664561 is an equidigital number, since it uses as much as digits as its factorization.

10664561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 10664561 is about 3265.6639447439. The cubic root of 10664561 is about 220.1139973936.

The spelling of 10664561 in words is "ten million, six hundred sixty-four thousand, five hundred sixty-one".