79828203181 has 4 divisors (see below), whose sum is σ = 79828969500. Its totient is φ = 79827436864.

The previous prime is 79828203179. The next prime is 79828203193. The reversal of 79828203181 is 18130282897.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18130282897 = 15809 ⋅1146833.

It can be written as a sum of positive squares in 2 ways, for example, as 72665289225 + 7162913956 = 269565^2 + 84634^2 .

It is a cyclic number.

It is not a de Polignac number, because 79828203181 - 2¹ = 79828203179 is a prime.

It is a super-2 number, since 2×79828203181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79828203121) 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, 196636 + ... + 445333.

It is an arithmetic number, because the mean of its divisors is an integer number (19957242375).

Almost surely, 2^79828203181 is an apocalyptic number.

It is an amenable number.

79828203181 is a deficient number, since it is larger than the sum of its proper divisors (766319).

79828203181 is a wasteful number, since it uses less digits than its factorization.

79828203181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766318.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 79828203181 in words is "seventy-nine billion, eight hundred twenty-eight million, two hundred three thousand, one hundred eighty-one".