78042566807 has 2 divisors, whose sum is σ = 78042566808. Its totient is φ = 78042566806.

The previous prime is 78042566729. The next prime is 78042566839. The reversal of 78042566807 is 70866524087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78042566807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78042566857) 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, 39021283403 + 39021283404.

It is an arithmetic number, because the mean of its divisors is an integer number (39021283404).

Almost surely, 2^78042566807 is an apocalyptic number.

78042566807 is a deficient number, since it is larger than the sum of its proper divisors (1).

78042566807 is an equidigital number, since it uses as much as digits as its factorization.

78042566807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 78042566807 in words is "seventy-eight billion, forty-two million, five hundred sixty-six thousand, eight hundred seven".