10523643665 has 4 divisors (see below), whose sum is σ = 12628372404. Its totient is φ = 8418914928.

The previous prime is 10523643649. The next prime is 10523643673. The reversal of 10523643665 is 56634632501.

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 1648684816 + 8874958849 = 40604^2 + 94207^2 .

It is a cyclic number.

It is not a de Polignac number, because 10523643665 - 2⁴ = 10523643649 is a prime.

It is a super-2 number, since 2×10523643665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052364362 + ... + 1052364371.

It is an arithmetic number, because the mean of its divisors is an integer number (3157093101).

Almost surely, 2^10523643665 is an apocalyptic number.

It is an amenable number.

10523643665 is a deficient number, since it is larger than the sum of its proper divisors (2104728739).

10523643665 is an equidigital number, since it uses as much as digits as its factorization.

10523643665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104728738.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 10523643665 in words is "ten billion, five hundred twenty-three million, six hundred forty-three thousand, six hundred sixty-five".