7142857142257 has 2 divisors, whose sum is σ = 7142857142258. Its totient is φ = 7142857142256.

The previous prime is 7142857142243. The next prime is 7142857142273. The reversal of 7142857142257 is 7522417582417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6432493047696 + 710364094561 = 2536236^2 + 842831^2 .

It is a cyclic number.

It is not a de Polignac number, because 7142857142257 - 2¹⁵ = 7142857109489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7142857142198 and 7142857142207.

It is not a weakly prime, because it can be changed into another prime (7142857142227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3571428571128 + 3571428571129.

It is an arithmetic number, because the mean of its divisors is an integer number (3571428571129).

Almost surely, 2^{7142857142257} is an apocalyptic number.

It is an amenable number.

7142857142257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7142857142257 is an equidigital number, since it uses as much as digits as its factorization.

7142857142257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8780800, while the sum is 55.

The spelling of 7142857142257 in words is "seven trillion, one hundred forty-two billion, eight hundred fifty-seven million, one hundred forty-two thousand, two hundred fifty-seven".