8645221357 has 2 divisors, whose sum is σ = 8645221358. Its totient is φ = 8645221356.

The previous prime is 8645221339. The next prime is 8645221367. The reversal of 8645221357 is 7531225468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5512468516 + 3132752841 = 74246^2 + 55971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8645221357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8645221367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322610678 + 4322610679.

It is an arithmetic number, because the mean of its divisors is an integer number (4322610679).

Almost surely, 2^8645221357 is an apocalyptic number.

It is an amenable number.

8645221357 is a deficient number, since it is larger than the sum of its proper divisors (1).

8645221357 is an equidigital number, since it uses as much as digits as its factorization.

8645221357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 43.

The square root of 8645221357 is about 92979.6824956936. The cubic root of 8645221357 is about 2052.3844043887.

The spelling of 8645221357 in words is "eight billion, six hundred forty-five million, two hundred twenty-one thousand, three hundred fifty-seven".