2668309493 has 2 divisors, whose sum is σ = 2668309494. Its totient is φ = 2668309492.

The previous prime is 2668309489. The next prime is 2668309507. The reversal of 2668309493 is 3949038662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1843585969 + 824723524 = 42937^2 + 28718^2 .

It is a cyclic number.

It is not a de Polignac number, because 2668309493 - 2² = 2668309489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2668309463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334154746 + 1334154747.

It is an arithmetic number, because the mean of its divisors is an integer number (1334154747).

Almost surely, 2^2668309493 is an apocalyptic number.

It is an amenable number.

2668309493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2668309493 is an equidigital number, since it uses as much as digits as its factorization.

2668309493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 2668309493 is about 51655.6820979067. The cubic root of 2668309493 is about 1387.0072582832.

The spelling of 2668309493 in words is "two billion, six hundred sixty-eight million, three hundred nine thousand, four hundred ninety-three".