2781873558721 has 4 divisors (see below), whose sum is σ = 2783714641344. Its totient is φ = 2780032476100.

The previous prime is 2781873558707. The next prime is 2781873558757. The reversal of 2781873558721 is 1278553781872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2781873558721 - 2¹³ = 2781873550529 is a prime.

It is a super-2 number, since 2×2781873558721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781873558791) 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, 920539045 + ... + 920542066.

It is an arithmetic number, because the mean of its divisors is an integer number (695928660336).

Almost surely, 2^{2781873558721} is an apocalyptic number.

It is an amenable number.

2781873558721 is a deficient number, since it is larger than the sum of its proper divisors (1841082623).

2781873558721 is a wasteful number, since it uses less digits than its factorization.

2781873558721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841082622.

The product of its digits is 52684800, while the sum is 64.

The spelling of 2781873558721 in words is "two trillion, seven hundred eighty-one billion, eight hundred seventy-three million, five hundred fifty-eight thousand, seven hundred twenty-one".