78657871593 has 16 divisors (see below), whose sum is σ = 122783020416. Its totient is φ = 43851077760.

The previous prime is 78657871583. The next prime is 78657871597. The reversal of 78657871593 is 39517875687.

It is not a de Polignac number, because 78657871593 - 2⁶ = 78657871529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78657871597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45677346 + ... + 45679067.

It is an arithmetic number, because the mean of its divisors is an integer number (7673938776).

Almost surely, 2^78657871593 is an apocalyptic number.

It is an amenable number.

78657871593 is a deficient number, since it is larger than the sum of its proper divisors (44125148823).

78657871593 is a wasteful number, since it uses less digits than its factorization.

78657871593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91356464.

The product of its digits is 88905600, while the sum is 66.

The spelling of 78657871593 in words is "seventy-eight billion, six hundred fifty-seven million, eight hundred seventy-one thousand, five hundred ninety-three".