78585446585 has 4 divisors (see below), whose sum is σ = 94302535908. Its totient is φ = 62868357264.

The previous prime is 78585446573. The next prime is 78585446587. The reversal of 78585446585 is 58564458587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58564458587 = 57383 ⋅1020589.

It can be written as a sum of positive squares in 2 ways, for example, as 16707889081 + 61877557504 = 129259^2 + 248752^2 .

It is a cyclic number.

It is not a de Polignac number, because 78585446585 - 2¹² = 78585442489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78585446587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7858544654 + ... + 7858544663.

It is an arithmetic number, because the mean of its divisors is an integer number (23575633977).

Almost surely, 2^78585446585 is an apocalyptic number.

It is an amenable number.

78585446585 is a deficient number, since it is larger than the sum of its proper divisors (15717089323).

78585446585 is a wasteful number, since it uses less digits than its factorization.

78585446585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15717089322.

The product of its digits is 215040000, while the sum is 65.

The spelling of 78585446585 in words is "seventy-eight billion, five hundred eighty-five million, four hundred forty-six thousand, five hundred eighty-five".