85078391409 has 48 divisors (see below), whose sum is σ = 139657689600. Its totient is φ = 49441363200.

The previous prime is 85078391393. The next prime is 85078391423. The reversal of 85078391409 is 90419387058.

85078391409 is a `hidden beast` number, since 8 + 507 + 8 + 3 + 91 + 40 + 9 = 666.

It is not a de Polignac number, because 85078391409 - 2⁴ = 85078391393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85078391429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207357 + ... + 461685.

It is an arithmetic number, because the mean of its divisors is an integer number (2909535200).

Almost surely, 2^85078391409 is an apocalyptic number.

It is an amenable number.

85078391409 is a deficient number, since it is larger than the sum of its proper divisors (54579298191).

85078391409 is a wasteful number, since it uses less digits than its factorization.

85078391409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254486 (or 254483 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 85078391409 in words is "eighty-five billion, seventy-eight million, three hundred ninety-one thousand, four hundred nine".