78427805915 has 16 divisors (see below), whose sum is σ = 100600508736. Its totient is φ = 58550553600.

The previous prime is 78427805903. The next prime is 78427805941. The reversal of 78427805915 is 51950872487.

It is not a de Polignac number, because 78427805915 - 2¹⁰ = 78427804891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 8312126 + ... + 8321555.

It is an arithmetic number, because the mean of its divisors is an integer number (6287531796).

Almost surely, 2^78427805915 is an apocalyptic number.

78427805915 is a deficient number, since it is larger than the sum of its proper divisors (22172702821).

78427805915 is a wasteful number, since it uses less digits than its factorization.

78427805915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16633750.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 78427805915 in words is "seventy-eight billion, four hundred twenty-seven million, eight hundred five thousand, nine hundred fifteen".