2543126657 has 2 divisors, whose sum is σ = 2543126658. Its totient is φ = 2543126656.

The previous prime is 2543126617. The next prime is 2543126659. The reversal of 2543126657 is 7566213452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2149342321 + 393784336 = 46361^2 + 19844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543126657 - 2²⁶ = 2476017793 is a prime.

Together with 2543126659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2543126659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271563328 + 1271563329.

It is an arithmetic number, because the mean of its divisors is an integer number (1271563329).

Almost surely, 2^2543126657 is an apocalyptic number.

It is an amenable number.

2543126657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543126657 is an equidigital number, since it uses as much as digits as its factorization.

2543126657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 2543126657 is about 50429.4225328825. The cubic root of 2543126657 is about 1364.9686078286.

The spelling of 2543126657 in words is "two billion, five hundred forty-three million, one hundred twenty-six thousand, six hundred fifty-seven".