10665661 has 2 divisors, whose sum is σ = 10665662. Its totient is φ = 10665660.

The previous prime is 10665637. The next prime is 10665673. The reversal of 10665661 is 16656601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 1454436 = 3035^2 + 1206^2 .

It is a cyclic number.

It is not a de Polignac number, because 10665661 - 2¹³ = 10657469 is a prime.

It is a super-2 number, since 2×10665661² = 227512649133842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10665761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332830 + 5332831.

It is an arithmetic number, because the mean of its divisors is an integer number (5332831).

Almost surely, 2^10665661 is an apocalyptic number.

It is an amenable number.

10665661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10665661 is an equidigital number, since it uses as much as digits as its factorization.

10665661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 10665661 is about 3265.8323594453. The cubic root of 10665661 is about 220.1215650460.

The spelling of 10665661 in words is "ten million, six hundred sixty-five thousand, six hundred sixty-one".