10551665609 has 4 divisors (see below), whose sum is σ = 10628685204. Its totient is φ = 10474646016.

The previous prime is 10551665603. The next prime is 10551665617. The reversal of 10551665609 is 90656615501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4733027209 + 5818638400 = 68797^2 + 76280^2 .

It is a cyclic number.

It is not a de Polignac number, because 10551665609 - 2²⁴ = 10534888393 is a prime.

It is a super-2 number, since 2×10551665609² (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 10551665609.

It is not an unprimeable number, because it can be changed into a prime (10551665603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38509592 + ... + 38509865.

It is an arithmetic number, because the mean of its divisors is an integer number (2657171301).

Almost surely, 2^10551665609 is an apocalyptic number.

It is an amenable number.

10551665609 is a deficient number, since it is larger than the sum of its proper divisors (77019595).

10551665609 is an equidigital number, since it uses as much as digits as its factorization.

10551665609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77019594.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 10551665609 in words is "ten billion, five hundred fifty-one million, six hundred sixty-five thousand, six hundred nine".