78518174782345 has 8 divisors (see below), whose sum is σ = 94223336784264. Its totient is φ = 62813521795584.

The previous prime is 78518174782279. The next prime is 78518174782381. The reversal of 78518174782345 is 54328747181587.

It can be written as a sum of positive squares in 4 ways, for example, as 5141887310329 + 73376287472016 = 2267573^2 + 8565996^2 .

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 78518174782345 - 2¹⁵ = 78518174749577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126914344 + ... + 127531513.

It is an arithmetic number, because the mean of its divisors is an integer number (11777917098033).

Almost surely, 2^{78518174782345} is an apocalyptic number.

It is an amenable number.

78518174782345 is a deficient number, since it is larger than the sum of its proper divisors (15705162001919).

78518174782345 is a wasteful number, since it uses less digits than its factorization.

78518174782345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254507579.

The product of its digits is 421478400, while the sum is 70.

The spelling of 78518174782345 in words is "seventy-eight trillion, five hundred eighteen billion, one hundred seventy-four million, seven hundred eighty-two thousand, three hundred forty-five".