10665600661 has 4 divisors (see below), whose sum is σ = 10670772672. Its totient is φ = 10660428652.

The previous prime is 10665600643. The next prime is 10665600689. The reversal of 10665600661 is 16600656601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16600656601 = 2879 ⋅5766119.

It is a cyclic number.

It is not a de Polignac number, because 10665600661 - 2¹⁵ = 10665567893 is a prime.

It is a super-2 number, since 2×10665600661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10665600661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10665600611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582911 + ... + 2587036.

It is an arithmetic number, because the mean of its divisors is an integer number (2667693168).

Almost surely, 2^10665600661 is an apocalyptic number.

It is an amenable number.

10665600661 is a deficient number, since it is larger than the sum of its proper divisors (5172011).

10665600661 is an equidigital number, since it uses as much as digits as its factorization.

10665600661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172010.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 10665600661 in words is "ten billion, six hundred sixty-five million, six hundred thousand, six hundred sixty-one".