2557008661 has 2 divisors, whose sum is σ = 2557008662. Its totient is φ = 2557008660.

The previous prime is 2557008653. The next prime is 2557008679. The reversal of 2557008661 is 1668007552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2226896100 + 330112561 = 47190^2 + 18169^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557008661 - 2³ = 2557008653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557000661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278504330 + 1278504331.

It is an arithmetic number, because the mean of its divisors is an integer number (1278504331).

Almost surely, 2^2557008661 is an apocalyptic number.

It is an amenable number.

2557008661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557008661 is an equidigital number, since it uses as much as digits as its factorization.

2557008661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 2557008661 is about 50566.8731582248. The cubic root of 2557008661 is about 1367.4477249083.

The spelling of 2557008661 in words is "two billion, five hundred fifty-seven million, eight thousand, six hundred sixty-one".