2563750661 has 2 divisors, whose sum is σ = 2563750662. Its totient is φ = 2563750660.

The previous prime is 2563750633. The next prime is 2563750663. The reversal of 2563750661 is 1660573652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1803700900 + 760049761 = 42470^2 + 27569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2563750661 is a prime.

Together with 2563750663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2563750663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281875330 + 1281875331.

It is an arithmetic number, because the mean of its divisors is an integer number (1281875331).

Almost surely, 2^2563750661 is an apocalyptic number.

It is an amenable number.

2563750661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2563750661 is an equidigital number, since it uses as much as digits as its factorization.

2563750661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 2563750661 is about 50633.4934702317. The cubic root of 2563750661 is about 1368.6485084328.

The spelling of 2563750661 in words is "two billion, five hundred sixty-three million, seven hundred fifty thousand, six hundred sixty-one".