2557666117 has 2 divisors, whose sum is σ = 2557666118. Its totient is φ = 2557666116.

The previous prime is 2557666091. The next prime is 2557666213. The reversal of 2557666117 is 7116667552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2532001761 + 25664356 = 50319^2 + 5066^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557666117 - 2¹¹ = 2557664069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557666417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278833058 + 1278833059.

It is an arithmetic number, because the mean of its divisors is an integer number (1278833059).

Almost surely, 2^2557666117 is an apocalyptic number.

It is an amenable number.

2557666117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557666117 is an equidigital number, since it uses as much as digits as its factorization.

2557666117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 46.

The square root of 2557666117 is about 50573.3735971806. The cubic root of 2557666117 is about 1367.5649138829.

The spelling of 2557666117 in words is "two billion, five hundred fifty-seven million, six hundred sixty-six thousand, one hundred seventeen".