2688366691 has 2 divisors, whose sum is σ = 2688366692. Its totient is φ = 2688366690.

The previous prime is 2688366599. The next prime is 2688366697. The reversal of 2688366691 is 1966638862.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2688366691 - 2¹⁹ = 2687842403 is a prime.

It is not a weakly prime, because it can be changed into another prime (2688366697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344183345 + 1344183346.

It is an arithmetic number, because the mean of its divisors is an integer number (1344183346).

Almost surely, 2^2688366691 is an apocalyptic number.

2688366691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2688366691 is an equidigital number, since it uses as much as digits as its factorization.

2688366691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 55.

The square root of 2688366691 is about 51849.4618197721. The cubic root of 2688366691 is about 1390.4738806595.

The spelling of 2688366691 in words is "two billion, six hundred eighty-eight million, three hundred sixty-six thousand, six hundred ninety-one".