79986842893 has 4 divisors (see below), whose sum is σ = 80028920988. Its totient is φ = 79944764800.

The previous prime is 79986842869. The next prime is 79986842911. The reversal of 79986842893 is 39824868997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39824868997 = 113 ⋅352432469.

It can be written as a sum of positive squares in 2 ways, for example, as 32119091524 + 47867751369 = 179218^2 + 218787^2 .

It is a cyclic number.

It is not a de Polignac number, because 79986842893 - 2¹³ = 79986834701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79986842813) 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, 21036196 + ... + 21039997.

It is an arithmetic number, because the mean of its divisors is an integer number (20007230247).

Almost surely, 2^79986842893 is an apocalyptic number.

It is an amenable number.

79986842893 is a deficient number, since it is larger than the sum of its proper divisors (42078095).

79986842893 is a wasteful number, since it uses less digits than its factorization.

79986842893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42078094.

The product of its digits is 376233984, while the sum is 73.

The spelling of 79986842893 in words is "seventy-nine billion, nine hundred eighty-six million, eight hundred forty-two thousand, eight hundred ninety-three".