2578445831345 has 4 divisors (see below), whose sum is σ = 3094134997620. Its totient is φ = 2062756665072.

The previous prime is 2578445831329. The next prime is 2578445831369. The reversal of 2578445831345 is 5431385448752.

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 1542268418161 + 1036177413184 = 1241881^2 + 1017928^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578445831345 - 2⁴ = 2578445831329 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 257844583130 + ... + 257844583139.

It is an arithmetic number, because the mean of its divisors is an integer number (773533749405).

Almost surely, 2^{2578445831345} is an apocalyptic number.

It is an amenable number.

2578445831345 is a deficient number, since it is larger than the sum of its proper divisors (515689166275).

2578445831345 is an equidigital number, since it uses as much as digits as its factorization.

2578445831345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515689166274.

The product of its digits is 64512000, while the sum is 59.

The spelling of 2578445831345 in words is "two trillion, five hundred seventy-eight billion, four hundred forty-five million, eight hundred thirty-one thousand, three hundred forty-five".