4966161821 has 2 divisors, whose sum is σ = 4966161822. Its totient is φ = 4966161820.

The previous prime is 4966161797. The next prime is 4966161847. The reversal of 4966161821 is 1281616694.

4966161821 is digitally balanced in base 3, 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., 2812180900 + 2153980921 = 53030^2 + 46411^2 .

It is a cyclic number.

It is not a de Polignac number, because 4966161821 - 2²⁶ = 4899052957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4966161881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2483080910 + 2483080911.

It is an arithmetic number, because the mean of its divisors is an integer number (2483080911).

Almost surely, 2^4966161821 is an apocalyptic number.

It is an amenable number.

4966161821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4966161821 is an equidigital number, since it uses as much as digits as its factorization.

4966161821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 4966161821 is about 70470.9998580977. Note that the first 3 decimals coincide. The cubic root of 4966161821 is about 1706.1097136183.

The spelling of 4966161821 in words is "four billion, nine hundred sixty-six million, one hundred sixty-one thousand, eight hundred twenty-one".