7840664473 has 2 divisors, whose sum is σ = 7840664474. Its totient is φ = 7840664472.

The previous prime is 7840664459. The next prime is 7840664477. The reversal of 7840664473 is 3744660487.

It is a happy number.

7840664473 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7142278144 + 698386329 = 84512^2 + 26427^2 .

It is a cyclic number.

It is not a de Polignac number, because 7840664473 - 2¹⁷ = 7840533401 is a prime.

It is a super-2 number, since 2×7840664473² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7840664477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3920332236 + 3920332237.

It is an arithmetic number, because the mean of its divisors is an integer number (3920332237).

Almost surely, 2^7840664473 is an apocalyptic number.

It is an amenable number.

7840664473 is a deficient number, since it is larger than the sum of its proper divisors (1).

7840664473 is an equidigital number, since it uses as much as digits as its factorization.

7840664473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 49.

The square root of 7840664473 is about 88547.5266340060. The cubic root of 7840664473 is about 1986.6328987543.

The spelling of 7840664473 in words is "seven billion, eight hundred forty million, six hundred sixty-four thousand, four hundred seventy-three".