2566989517 has 2 divisors, whose sum is σ = 2566989518. Its totient is φ = 2566989516.

The previous prime is 2566989487. The next prime is 2566989539. The reversal of 2566989517 is 7159896652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2535021801 + 31967716 = 50349^2 + 5654^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566989517 - 2³¹ = 419505869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2566989917) 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 as a sum of consecutive naturals, namely, 1283494758 + 1283494759.

It is an arithmetic number, because the mean of its divisors is an integer number (1283494759).

Almost surely, 2^2566989517 is an apocalyptic number.

It is an amenable number.

2566989517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566989517 is an equidigital number, since it uses as much as digits as its factorization.

2566989517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 58.

The square root of 2566989517 is about 50665.4667105712. The cubic root of 2566989517 is about 1369.2246162026.

The spelling of 2566989517 in words is "two billion, five hundred sixty-six million, nine hundred eighty-nine thousand, five hundred seventeen".