78427805903 has 2 divisors, whose sum is σ = 78427805904. Its totient is φ = 78427805902.

The previous prime is 78427805891. The next prime is 78427805941. The reversal of 78427805903 is 30950872487.

It is a weak prime.

It is an emirp because it is prime and its reverse (30950872487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78427805903 - 2⁸ = 78427805647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78427805983) 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, 39213902951 + 39213902952.

It is an arithmetic number, because the mean of its divisors is an integer number (39213902952).

Almost surely, 2^78427805903 is an apocalyptic number.

78427805903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78427805903 is an equidigital number, since it uses as much as digits as its factorization.

78427805903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 78427805903 in words is "seventy-eight billion, four hundred twenty-seven million, eight hundred five thousand, nine hundred three".