800979539693 has 4 divisors (see below), whose sum is σ = 802015736508. Its totient is φ = 799943342880.

The previous prime is 800979539669. The next prime is 800979539707. The reversal of 800979539693 is 396935979008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 265268261764 + 535711277929 = 515042^2 + 731923^2 .

It is a cyclic number.

It is not a de Polignac number, because 800979539693 - 2¹⁶ = 800979474157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800979539603) 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, 518097248 + ... + 518098793.

It is an arithmetic number, because the mean of its divisors is an integer number (200503934127).

Almost surely, 2^800979539693 is an apocalyptic number.

It is an amenable number.

800979539693 is a deficient number, since it is larger than the sum of its proper divisors (1036196815).

800979539693 is a wasteful number, since it uses less digits than its factorization.

800979539693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036196814.

The product of its (nonzero) digits is 99202320, while the sum is 68.

The spelling of 800979539693 in words is "eight hundred billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, six hundred ninety-three".