79943824861 has 8 divisors (see below), whose sum is σ = 84649666680. Its totient is φ = 75238345728.

The previous prime is 79943824859. The next prime is 79943824903. The reversal of 79943824861 is 16842834997.

It can be written as a sum of positive squares in 4 ways, for example, as 8245729636 + 71698095225 = 90806^2 + 267765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79943824861 - 2¹ = 79943824859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79943824861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79943824061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458085 + ... + 608053.

It is an arithmetic number, because the mean of its divisors is an integer number (10581208335).

Almost surely, 2^79943824861 is an apocalyptic number.

It is an amenable number.

79943824861 is a deficient number, since it is larger than the sum of its proper divisors (4705841819).

79943824861 is a wasteful number, since it uses less digits than its factorization.

79943824861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181343.

The product of its digits is 20901888, while the sum is 61.

The spelling of 79943824861 in words is "seventy-nine billion, nine hundred forty-three million, eight hundred twenty-four thousand, eight hundred sixty-one".