2563750681 has 2 divisors, whose sum is σ = 2563750682. Its totient is φ = 2563750680.

The previous prime is 2563750669. The next prime is 2563750691. The reversal of 2563750681 is 1860573652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2546110681 + 17640000 = 50459^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563750681 - 2⁹ = 2563750169 is a prime.

It is a super-2 number, since 2×2563750681² = 13145635108655927522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2563750661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281875340 + 1281875341.

It is an arithmetic number, because the mean of its divisors is an integer number (1281875341).

Almost surely, 2^2563750681 is an apocalyptic number.

It is an amenable number.

2563750681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2563750681 is an equidigital number, since it uses as much as digits as its factorization.

2563750681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 2563750681 is about 50633.4936677295. The cubic root of 2563750681 is about 1368.6485119918.

The spelling of 2563750681 in words is "two billion, five hundred sixty-three million, seven hundred fifty thousand, six hundred eighty-one".