2578117851618 has 8 divisors (see below), whose sum is σ = 5156235703248. Its totient is φ = 859372617204.

The previous prime is 2578117851583. The next prime is 2578117851619. The reversal of 2578117851618 is 8161587118752.

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

2578117851618 is an admirable number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2578117851619) 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, 214843154296 + ... + 214843154307.

It is an arithmetic number, because the mean of its divisors is an integer number (644529462906).

Almost surely, 2^{2578117851618} is an apocalyptic number.

2578117851618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2578117851618 is a wasteful number, since it uses less digits than its factorization.

2578117851618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429686308608.

The product of its digits is 7526400, while the sum is 60.

The spelling of 2578117851618 in words is "two trillion, five hundred seventy-eight billion, one hundred seventeen million, eight hundred fifty-one thousand, six hundred eighteen".