1638168299 has 2 divisors, whose sum is σ = 1638168300. Its totient is φ = 1638168298.

The previous prime is 1638168293. The next prime is 1638168373. The reversal of 1638168299 is 9928618361.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1638168299 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1638168299.

It is not a weakly prime, because it can be changed into another prime (1638168293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819084149 + 819084150.

It is an arithmetic number, because the mean of its divisors is an integer number (819084150).

Almost surely, 2^1638168299 is an apocalyptic number.

1638168299 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638168299 is an equidigital number, since it uses as much as digits as its factorization.

1638168299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 53.

The square root of 1638168299 is about 40474.2918282704. The cubic root of 1638168299 is about 1178.8345044332.

The spelling of 1638168299 in words is "one billion, six hundred thirty-eight million, one hundred sixty-eight thousand, two hundred ninety-nine".