2557281161 has 8 divisors (see below), whose sum is σ = 2653818120. Its totient is φ = 2461301248.

The previous prime is 2557281149. The next prime is 2557281169. The reversal of 2557281161 is 1611827552.

It can be written as a sum of positive squares in 4 ways, for example, as 20647936 + 2536633225 = 4544^2 + 50365^2 .

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 2557281161 - 2²⁶ = 2490172297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557281169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129896 + ... + 148281.

It is an arithmetic number, because the mean of its divisors is an integer number (331727265).

Almost surely, 2^2557281161 is an apocalyptic number.

It is an amenable number.

2557281161 is a deficient number, since it is larger than the sum of its proper divisors (96536959).

2557281161 is a wasteful number, since it uses less digits than its factorization.

2557281161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278523.

The product of its digits is 33600, while the sum is 38.

The square root of 2557281161 is about 50569.5675381944. The cubic root of 2557281161 is about 1367.4962994106.

The spelling of 2557281161 in words is "two billion, five hundred fifty-seven million, two hundred eighty-one thousand, one hundred sixty-one".