2666288509 has 2 divisors, whose sum is σ = 2666288510. Its totient is φ = 2666288508.

The previous prime is 2666288503. The next prime is 2666288519. The reversal of 2666288509 is 9058826662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1797336025 + 868952484 = 42395^2 + 29478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2666288509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666288503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333144254 + 1333144255.

It is an arithmetic number, because the mean of its divisors is an integer number (1333144255).

Almost surely, 2^2666288509 is an apocalyptic number.

It is an amenable number.

2666288509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666288509 is an equidigital number, since it uses as much as digits as its factorization.

2666288509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The square root of 2666288509 is about 51636.1163237515. The cubic root of 2666288509 is about 1386.6569956321.

The spelling of 2666288509 in words is "two billion, six hundred sixty-six million, two hundred eighty-eight thousand, five hundred nine".