4856640781 has 2 divisors, whose sum is σ = 4856640782. Its totient is φ = 4856640780.

The previous prime is 4856640703. The next prime is 4856640791. The reversal of 4856640781 is 1870466584.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3631990756 + 1224650025 = 60266^2 + 34995^2 .

It is a cyclic number.

It is not a de Polignac number, because 4856640781 - 2¹³ = 4856632589 is a prime.

It is a super-2 number, since 2×4856640781² = 47173919351344579922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4856640791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2428320390 + 2428320391.

It is an arithmetic number, because the mean of its divisors is an integer number (2428320391).

Almost surely, 2^4856640781 is an apocalyptic number.

It is an amenable number.

4856640781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4856640781 is an equidigital number, since it uses as much as digits as its factorization.

4856640781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The square root of 4856640781 is about 69689.6031054848. The cubic root of 4856640781 is about 1693.4744970830.

The spelling of 4856640781 in words is "four billion, eight hundred fifty-six million, six hundred forty thousand, seven hundred eighty-one".