10661568569 has 4 divisors (see below), whose sum is σ = 10672594944. Its totient is φ = 10650542196.

The previous prime is 10661568523. The next prime is 10661568583. The reversal of 10661568569 is 96586516601.

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.

It is a cyclic number.

It is not a de Polignac number, because 10661568569 - 2²⁰ = 10660519993 is a prime.

It is a super-2 number, since 2×10661568569² (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 10661568569.

It is not an unprimeable number, because it can be changed into a prime (10661568769) 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, 5511737 + ... + 5513670.

It is an arithmetic number, because the mean of its divisors is an integer number (2668148736).

Almost surely, 2^10661568569 is an apocalyptic number.

It is an amenable number.

10661568569 is a deficient number, since it is larger than the sum of its proper divisors (11026375).

10661568569 is an equidigital number, since it uses as much as digits as its factorization.

10661568569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11026374.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 10661568569 in words is "ten billion, six hundred sixty-one million, five hundred sixty-eight thousand, five hundred sixty-nine".