78795618217 has 8 divisors (see below), whose sum is σ = 79693727400. Its totient is φ = 77899259904.

The previous prime is 78795618197. The next prime is 78795618221. The reversal of 78795618217 is 71281659787.

It can be written as a sum of positive squares in 4 ways, for example, as 7495403776 + 71300214441 = 86576^2 + 267021^2 .

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 78795618217 - 2³¹ = 76648134569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78795616217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347092 + ... + 527317.

It is an arithmetic number, because the mean of its divisors is an integer number (9961715925).

Almost surely, 2^78795618217 is an apocalyptic number.

It is an amenable number.

78795618217 is a deficient number, since it is larger than the sum of its proper divisors (898109183).

78795618217 is an equidigital number, since it uses as much as digits as its factorization.

78795618217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875435.

The product of its digits is 11854080, while the sum is 61.

The spelling of 78795618217 in words is "seventy-eight billion, seven hundred ninety-five million, six hundred eighteen thousand, two hundred seventeen".