10661605609 has 2 divisors, whose sum is σ = 10661605610. Its totient is φ = 10661605608.

The previous prime is 10661605597. The next prime is 10661605621. The reversal of 10661605609 is 90650616601.

It is a balanced prime because it is at equal distance from previous prime (10661605597) and next prime (10661605621).

It can be written as a sum of positive squares in only one way, i.e., 9277542400 + 1384063209 = 96320^2 + 37203^2 .

It is a cyclic number.

It is not a de Polignac number, because 10661605609 - 2¹³ = 10661597417 is a prime.

It is a super-2 number, since 2×10661605609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10661605649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330802804 + 5330802805.

It is an arithmetic number, because the mean of its divisors is an integer number (5330802805).

Almost surely, 2^10661605609 is an apocalyptic number.

It is an amenable number.

10661605609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661605609 is an equidigital number, since it uses as much as digits as its factorization.

10661605609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 10661605609 in words is "ten billion, six hundred sixty-one million, six hundred five thousand, six hundred nine".