2557277561 has 2 divisors, whose sum is σ = 2557277562. Its totient is φ = 2557277560.

The previous prime is 2557277551. The next prime is 2557277617. The reversal of 2557277561 is 1657727552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2312167225 + 245110336 = 48085^2 + 15656^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557277561 - 2¹⁴ = 2557261177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2557277551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278638780 + 1278638781.

It is an arithmetic number, because the mean of its divisors is an integer number (1278638781).

Almost surely, 2^2557277561 is an apocalyptic number.

It is an amenable number.

2557277561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557277561 is an equidigital number, since it uses as much as digits as its factorization.

2557277561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1029000, while the sum is 47.

The square root of 2557277561 is about 50569.5319436516. The cubic root of 2557277561 is about 1367.4956577149.

The spelling of 2557277561 in words is "two billion, five hundred fifty-seven million, two hundred seventy-seven thousand, five hundred sixty-one".