78766663 has 2 divisors, whose sum is σ = 78766664. Its totient is φ = 78766662.

The previous prime is 78766603. The next prime is 78766687. The reversal of 78766663 is 36666787.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78766663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78766603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39383331 + 39383332.

It is an arithmetic number, because the mean of its divisors is an integer number (39383332).

Almost surely, 2^78766663 is an apocalyptic number.

78766663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78766663 is an equidigital number, since it uses as much as digits as its factorization.

78766663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 49.

The square root of 78766663 is about 8875.0584786806. The cubic root of 78766663 is about 428.6611738457.

The spelling of 78766663 in words is "seventy-eight million, seven hundred sixty-six thousand, six hundred sixty-three".