78985759779 has 12 divisors (see below), whose sum is σ = 115793386696. Its totient is φ = 51871244832.

The previous prime is 78985759759. The next prime is 78985759789. The reversal of 78985759779 is 97795758987.

It is a happy number.

It is not a de Polignac number, because 78985759779 - 2²⁴ = 78968982563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78985759698 and 78985759707.

It is not an unprimeable number, because it can be changed into a prime (78985759729) 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 in 11 ways as a sum of consecutive naturals, for example, 65493394 + ... + 65494599.

Almost surely, 2^78985759779 is an apocalyptic number.

78985759779 is a deficient number, since it is larger than the sum of its proper divisors (36807626917).

78985759779 is a wasteful number, since it uses less digits than its factorization.

78985759779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130988066 (or 130988063 counting only the distinct ones).

The product of its digits is 2800526400, while the sum is 81.

The spelling of 78985759779 in words is "seventy-eight billion, nine hundred eighty-five million, seven hundred fifty-nine thousand, seven hundred seventy-nine".