2557827981 has 6 divisors (see below), whose sum is σ = 3694640430. Its totient is φ = 1705218648.

The previous prime is 2557827959. The next prime is 2557827997. The reversal of 2557827981 is 1897287552.

2557827981 is a `hidden beast` number, since 2 + 557 + 8 + 2 + 7 + 9 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2268997956 + 288830025 = 47634^2 + 16995^2 .

It is not a de Polignac number, because 2557827981 - 2¹⁷ = 2557696909 is a prime.

It is a super-2 number, since 2×2557827981² = 13084967960773072722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557827911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142101546 + ... + 142101563.

It is an arithmetic number, because the mean of its divisors is an integer number (615773405).

Almost surely, 2^2557827981 is an apocalyptic number.

It is an amenable number.

2557827981 is a deficient number, since it is larger than the sum of its proper divisors (1136812449).

2557827981 is a wasteful number, since it uses less digits than its factorization.

2557827981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284203115 (or 284203112 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 54.

The square root of 2557827981 is about 50574.9738605963. The cubic root of 2557827981 is about 1367.5937624305.

The spelling of 2557827981 in words is "two billion, five hundred fifty-seven million, eight hundred twenty-seven thousand, nine hundred eighty-one".