78774030666491 has 2 divisors, whose sum is σ = 78774030666492. Its totient is φ = 78774030666490.

The previous prime is 78774030666347. The next prime is 78774030666497. The reversal of 78774030666491 is 19466603047787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78774030666491 - 2³⁰ = 78772956924667 is a prime.

It is not a weakly prime, because it can be changed into another prime (78774030666497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39387015333245 + 39387015333246.

It is an arithmetic number, because the mean of its divisors is an integer number (39387015333246).

Almost surely, 2^{78774030666491} is an apocalyptic number.

78774030666491 is a deficient number, since it is larger than the sum of its proper divisors (1).

78774030666491 is an equidigital number, since it uses as much as digits as its factorization.

78774030666491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256048128, while the sum is 68.

The spelling of 78774030666491 in words is "seventy-eight trillion, seven hundred seventy-four billion, thirty million, six hundred sixty-six thousand, four hundred ninety-one".