5966399821 has 2 divisors, whose sum is σ = 5966399822. Its totient is φ = 5966399820.

The previous prime is 5966399807. The next prime is 5966399833. The reversal of 5966399821 is 1289936695.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3056984100 + 2909415721 = 55290^2 + 53939^2 .

It is a cyclic number.

It is not a de Polignac number, because 5966399821 - 2⁷ = 5966399693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5966399851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2983199910 + 2983199911.

It is an arithmetic number, because the mean of its divisors is an integer number (2983199911).

Almost surely, 2^5966399821 is an apocalyptic number.

It is an amenable number.

5966399821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5966399821 is an equidigital number, since it uses as much as digits as its factorization.

5966399821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 58.

The square root of 5966399821 is about 77242.4742029927. The cubic root of 5966399821 is about 1813.7222648261.

The spelling of 5966399821 in words is "five billion, nine hundred sixty-six million, three hundred ninety-nine thousand, eight hundred twenty-one".