8021697473 has 2 divisors, whose sum is σ = 8021697474. Its totient is φ = 8021697472.

The previous prime is 8021697443. The next prime is 8021697493. The reversal of 8021697473 is 3747961208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6421137424 + 1600560049 = 80132^2 + 40007^2 .

It is a cyclic number.

It is not a de Polignac number, because 8021697473 - 2⁸ = 8021697217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8021697443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010848736 + 4010848737.

It is an arithmetic number, because the mean of its divisors is an integer number (4010848737).

Almost surely, 2^8021697473 is an apocalyptic number.

It is an amenable number.

8021697473 is a deficient number, since it is larger than the sum of its proper divisors (1).

8021697473 is an equidigital number, since it uses as much as digits as its factorization.

8021697473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 8021697473 is about 89563.9295308106. The cubic root of 8021697473 is about 2001.8064905547.

The spelling of 8021697473 in words is "eight billion, twenty-one million, six hundred ninety-seven thousand, four hundred seventy-three".