10115666065 has 4 divisors (see below), whose sum is σ = 12138799284. Its totient is φ = 8092532848.

The previous prime is 10115665979. The next prime is 10115666069. The reversal of 10115666065 is 56066651101.

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 6082908049 + 4032758016 = 77993^2 + 63504^2 .

It is a cyclic number.

It is not a de Polignac number, because 10115666065 - 2¹³ = 10115657873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10115666069) 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, 1011566602 + ... + 1011566611.

It is an arithmetic number, because the mean of its divisors is an integer number (3034699821).

Almost surely, 2^10115666065 is an apocalyptic number.

It is an amenable number.

10115666065 is a deficient number, since it is larger than the sum of its proper divisors (2023133219).

10115666065 is an equidigital number, since it uses as much as digits as its factorization.

10115666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023133218.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 10115666065 in words is "ten billion, one hundred fifteen million, six hundred sixty-six thousand, sixty-five".