340978663 has 2 divisors, whose sum is σ = 340978664. Its totient is φ = 340978662.

The previous prime is 340978633. The next prime is 340978681. The reversal of 340978663 is 366879043.

It is a strong prime.

It is an emirp because it is prime and its reverse (366879043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340978663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340978633) 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, 170489331 + 170489332.

It is an arithmetic number, because the mean of its divisors is an integer number (170489332).

Almost surely, 2^340978663 is an apocalyptic number.

340978663 is a deficient number, since it is larger than the sum of its proper divisors (1).

340978663 is an equidigital number, since it uses as much as digits as its factorization.

340978663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 340978663 is about 18465.6075719160. The cubic root of 340978663 is about 698.6222308127.

The spelling of 340978663 in words is "three hundred forty million, nine hundred seventy-eight thousand, six hundred sixty-three".