2668445509 has 2 divisors, whose sum is σ = 2668445510. Its totient is φ = 2668445508.

The previous prime is 2668445491. The next prime is 2668445531. The reversal of 2668445509 is 9055448662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1478402500 + 1190043009 = 38450^2 + 34497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2668445509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2668445009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334222754 + 1334222755.

It is an arithmetic number, because the mean of its divisors is an integer number (1334222755).

Almost surely, 2^2668445509 is an apocalyptic number.

It is an amenable number.

2668445509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2668445509 is an equidigital number, since it uses as much as digits as its factorization.

2668445509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The square root of 2668445509 is about 51656.9986449077. The cubic root of 2668445509 is about 1387.0308252613.

The spelling of 2668445509 in words is "two billion, six hundred sixty-eight million, four hundred forty-five thousand, five hundred nine".