2638846681 has 2 divisors, whose sum is σ = 2638846682. Its totient is φ = 2638846680.

The previous prime is 2638846667. The next prime is 2638846687. The reversal of 2638846681 is 1866488362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2134440000 + 504406681 = 46200^2 + 22459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638846681 - 2¹¹ = 2638844633 is a prime.

It is a super-2 number, since 2×2638846681² = 13927023611649431522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2638846687) 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, 1319423340 + 1319423341.

It is an arithmetic number, because the mean of its divisors is an integer number (1319423341).

Almost surely, 2^2638846681 is an apocalyptic number.

It is an amenable number.

2638846681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638846681 is an equidigital number, since it uses as much as digits as its factorization.

2638846681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 52.

The square root of 2638846681 is about 51369.7058683423. The cubic root of 2638846681 is about 1381.8833560204.

The spelling of 2638846681 in words is "two billion, six hundred thirty-eight million, eight hundred forty-six thousand, six hundred eighty-one".