2772587981881 has 3 divisors (see below), whose sum is σ = 2772589646991. Its totient is φ = 2772586316772.

The previous prime is 2772587981869. The next prime is 2772587981887. The reversal of 2772587981881 is 1881897852772.

The square root of 2772587981881 is 1665109.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 22894413481 + 2749693568400 = 151309^2 + 1658220^2 .

It is not a de Polignac number, because 2772587981881 - 2⁹ = 2772587981369 is a prime.

It is a super-2 number, since 2×2772587981881² (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 (2772587981887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 832555 + ... + 2497663.

It is an arithmetic number, because the mean of its divisors is an integer number (924196548997).

Almost surely, 2^{2772587981881} is an apocalyptic number.

2772587981881 is the 1665109-th square number.

2772587981881 is the 832555-th centered octagonal number.

It is an amenable number.

2772587981881 is a deficient number, since it is larger than the sum of its proper divisors (1665110).

2772587981881 is an frugal number, since it uses more digits than its factorization.

2772587981881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330218 (or 1665109 counting only the distinct ones).

The product of its digits is 252887040, while the sum is 73.

The spelling of 2772587981881 in words is "two trillion, seven hundred seventy-two billion, five hundred eighty-seven million, nine hundred eighty-one thousand, eight hundred eighty-one".