8223217957 has 2 divisors, whose sum is σ = 8223217958. Its totient is φ = 8223217956.

The previous prime is 8223217939. The next prime is 8223217979. The reversal of 8223217957 is 7597123228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7020931681 + 1202286276 = 83791^2 + 34674^2 .

It is a cyclic number.

It is not a de Polignac number, because 8223217957 - 2⁷ = 8223217829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8223217987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4111608978 + 4111608979.

It is an arithmetic number, because the mean of its divisors is an integer number (4111608979).

Almost surely, 2^8223217957 is an apocalyptic number.

It is an amenable number.

8223217957 is a deficient number, since it is larger than the sum of its proper divisors (1).

8223217957 is an equidigital number, since it uses as much as digits as its factorization.

8223217957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 8223217957 is about 90681.9604827774. The cubic root of 8223217957 is about 2018.4311215323.

The spelling of 8223217957 in words is "eight billion, two hundred twenty-three million, two hundred seventeen thousand, nine hundred fifty-seven".