42838056857 has 2 divisors, whose sum is σ = 42838056858. Its totient is φ = 42838056856.

The previous prime is 42838056841. The next prime is 42838056871. The reversal of 42838056857 is 75865083824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42706702336 + 131354521 = 206656^2 + 11461^2 .

It is a cyclic number.

It is not a de Polignac number, because 42838056857 - 2⁴ = 42838056841 is a prime.

It is not a weakly prime, because it can be changed into another prime (42838026857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21419028428 + 21419028429.

It is an arithmetic number, because the mean of its divisors is an integer number (21419028429).

Almost surely, 2^42838056857 is an apocalyptic number.

It is an amenable number.

42838056857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42838056857 is an equidigital number, since it uses as much as digits as its factorization.

42838056857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 42838056857 in words is "forty-two billion, eight hundred thirty-eight million, fifty-six thousand, eight hundred fifty-seven".