2578477778273 has 8 divisors (see below), whose sum is σ = 2703930407400. Its totient is φ = 2455461122688.

The previous prime is 2578477778251. The next prime is 2578477778287. The reversal of 2578477778273 is 3728777748752.

It can be written as a sum of positive squares in 4 ways, for example, as 655674009169 + 1922803769104 = 809737^2 + 1386652^2 .

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 2578477778273 - 2¹⁴ = 2578477761889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2578477778273.

It is not an unprimeable number, because it can be changed into a prime (2578477478273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608991218 + ... + 608995451.

It is an arithmetic number, because the mean of its divisors is an integer number (337991300925).

Almost surely, 2^{2578477778273} is an apocalyptic number.

It is an amenable number.

2578477778273 is a deficient number, since it is larger than the sum of its proper divisors (125452629127).

2578477778273 is a wasteful number, since it uses less digits than its factorization.

2578477778273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217986771.

The product of its digits is 1807088640, while the sum is 74.

The spelling of 2578477778273 in words is "two trillion, five hundred seventy-eight billion, four hundred seventy-seven million, seven hundred seventy-eight thousand, two hundred seventy-three".