2666343315065 has 4 divisors (see below), whose sum is σ = 3199611978084. Its totient is φ = 2133074652048.

The previous prime is 2666343314981. The next prime is 2666343315071. The reversal of 2666343315065 is 5605133436662.

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 1303807720336 + 1362535594729 = 1141844^2 + 1167277^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666343315065 - 2⁸ = 2666343314809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266634331502 + ... + 266634331511.

It is an arithmetic number, because the mean of its divisors is an integer number (799902994521).

Almost surely, 2^{2666343315065} is an apocalyptic number.

It is an amenable number.

2666343315065 is a deficient number, since it is larger than the sum of its proper divisors (533268663019).

2666343315065 is an equidigital number, since it uses as much as digits as its factorization.

2666343315065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533268663018.

The product of its (nonzero) digits is 6998400, while the sum is 50.

The spelling of 2666343315065 in words is "two trillion, six hundred sixty-six billion, three hundred forty-three million, three hundred fifteen thousand, sixty-five".