2668217509 has 8 divisors (see below), whose sum is σ = 2702486808. Its totient is φ = 2634086400.

The previous prime is 2668217501. The next prime is 2668217521. The reversal of 2668217509 is 9057128662.

It can be written as a sum of positive squares in 4 ways, for example, as 586850625 + 2081366884 = 24225^2 + 45622^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2668217509 - 2³ = 2668217501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668217501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4599 + ... + 73195.

It is an arithmetic number, because the mean of its divisors is an integer number (337810851).

Almost surely, 2^2668217509 is an apocalyptic number.

It is an amenable number.

2668217509 is a deficient number, since it is larger than the sum of its proper divisors (34269299).

2668217509 is an equidigital number, since it uses as much as digits as its factorization.

2668217509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69095.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 2668217509 is about 51654.7917331974. The cubic root of 2668217509 is about 1386.9913201094.

The spelling of 2668217509 in words is "two billion, six hundred sixty-eight million, two hundred seventeen thousand, five hundred nine".