8257978543 has 2 divisors, whose sum is σ = 8257978544. Its totient is φ = 8257978542.

The previous prime is 8257978507. The next prime is 8257978567. The reversal of 8257978543 is 3458797528.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8257978543 - 2⁹ = 8257978031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8257978243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128989271 + 4128989272.

It is an arithmetic number, because the mean of its divisors is an integer number (4128989272).

Almost surely, 2^8257978543 is an apocalyptic number.

8257978543 is a deficient number, since it is larger than the sum of its proper divisors (1).

8257978543 is an equidigital number, since it uses as much as digits as its factorization.

8257978543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16934400, while the sum is 58.

The square root of 8257978543 is about 90873.4204429436. The cubic root of 8257978543 is about 2021.2711783670.

The spelling of 8257978543 in words is "eight billion, two hundred fifty-seven million, nine hundred seventy-eight thousand, five hundred forty-three".