10663661 has 2 divisors, whose sum is σ = 10663662. Its totient is φ = 10663660.

The previous prime is 10663643. The next prime is 10663687. The reversal of 10663661 is 16636601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 866761 = 3130^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 10663661 - 2²² = 6469357 is a prime.

It is a super-2 number, since 2×10663661² = 227427331845842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10665661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331830 + 5331831.

It is an arithmetic number, because the mean of its divisors is an integer number (5331831).

Almost surely, 2^10663661 is an apocalyptic number.

It is an amenable number.

10663661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10663661 is an equidigital number, since it uses as much as digits as its factorization.

10663661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 10663661 is about 3265.5261444368. The cubic root of 10663661 is about 220.1078052909.

The spelling of 10663661 in words is "ten million, six hundred sixty-three thousand, six hundred sixty-one".