4947668081 has 2 divisors, whose sum is σ = 4947668082. Its totient is φ = 4947668080.

The previous prime is 4947668053. The next prime is 4947668149. The reversal of 4947668081 is 1808667494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4869946225 + 77721856 = 69785^2 + 8816^2 .

It is a cyclic number.

It is not a de Polignac number, because 4947668081 - 2¹⁴ = 4947651697 is a prime.

It is a super-2 number, since 2×4947668081² = 48958838879492445122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4947668041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2473834040 + 2473834041.

It is an arithmetic number, because the mean of its divisors is an integer number (2473834041).

Almost surely, 2^4947668081 is an apocalyptic number.

It is an amenable number.

4947668081 is a deficient number, since it is larger than the sum of its proper divisors (1).

4947668081 is an equidigital number, since it uses as much as digits as its factorization.

4947668081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 4947668081 is about 70339.6622184099. The cubic root of 4947668081 is about 1703.9892566613.

The spelling of 4947668081 in words is "four billion, nine hundred forty-seven million, six hundred sixty-eight thousand, eighty-one".