8257849397969 has 2 divisors, whose sum is σ = 8257849397970. Its totient is φ = 8257849397968.

The previous prime is 8257849397953. The next prime is 8257849398049. The reversal of 8257849397969 is 9697939487528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7509857929744 + 747991468225 = 2740412^2 + 864865^2 .

It is a cyclic number.

It is not a de Polignac number, because 8257849397969 - 2⁴ = 8257849397953 is a prime.

It is a super-2 number, since 2×8257849397969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8257849397939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128924698984 + 4128924698985.

It is an arithmetic number, because the mean of its divisors is an integer number (4128924698985).

Almost surely, 2^{8257849397969} is an apocalyptic number.

It is an amenable number.

8257849397969 is a deficient number, since it is larger than the sum of its proper divisors (1).

8257849397969 is an equidigital number, since it uses as much as digits as its factorization.

8257849397969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14814213120, while the sum is 86.

The spelling of 8257849397969 in words is "eight trillion, two hundred fifty-seven billion, eight hundred forty-nine million, three hundred ninety-seven thousand, nine hundred sixty-nine".