79854560209 has 4 divisors (see below), whose sum is σ = 82012791604. Its totient is φ = 77696328816.

The previous prime is 79854560189. The next prime is 79854560231. The reversal of 79854560209 is 90206545897.

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 58808675025 + 21045885184 = 242505^2 + 145072^2 .

It is a cyclic number.

It is not a de Polignac number, because 79854560209 - 2¹³ = 79854552017 is a prime.

It is a super-2 number, since 2×79854560209² (a number of 23 digits) contains 22 as substring.

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 79854560209.

It is not an unprimeable number, because it can be changed into a prime (79854560249) 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, 1079115642 + ... + 1079115715.

It is an arithmetic number, because the mean of its divisors is an integer number (20503197901).

Almost surely, 2^79854560209 is an apocalyptic number.

It is an amenable number.

79854560209 is a deficient number, since it is larger than the sum of its proper divisors (2158231395).

79854560209 is a wasteful number, since it uses less digits than its factorization.

79854560209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158231394.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 79854560209 in words is "seventy-nine billion, eight hundred fifty-four million, five hundred sixty thousand, two hundred nine".