4278641681 has 2 divisors, whose sum is σ = 4278641682. Its totient is φ = 4278641680.

The previous prime is 4278641671. The next prime is 4278641693. The reversal of 4278641681 is 1861468724.

4278641681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2617345600 + 1661296081 = 51160^2 + 40759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4278641681 is a prime.

It is a super-2 number, since 2×4278641681² = 36613549268781011522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4278641671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139320840 + 2139320841.

It is an arithmetic number, because the mean of its divisors is an integer number (2139320841).

Almost surely, 2^4278641681 is an apocalyptic number.

It is an amenable number.

4278641681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278641681 is an equidigital number, since it uses as much as digits as its factorization.

4278641681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 47.

The square root of 4278641681 is about 65411.3268555225. The cubic root of 4278641681 is about 1623.4364992778.

The spelling of 4278641681 in words is "four billion, two hundred seventy-eight million, six hundred forty-one thousand, six hundred eighty-one".