842354240257 has 2 divisors, whose sum is σ = 842354240258. Its totient is φ = 842354240256.

The previous prime is 842354240219. The next prime is 842354240261. The reversal of 842354240257 is 752042453248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546558575616 + 295795664641 = 739296^2 + 543871^2 .

It is a cyclic number.

It is not a de Polignac number, because 842354240257 - 2²³ = 842345851649 is a prime.

It is not a weakly prime, because it can be changed into another prime (842354240207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421177120128 + 421177120129.

It is an arithmetic number, because the mean of its divisors is an integer number (421177120129).

Almost surely, 2^842354240257 is an apocalyptic number.

It is an amenable number.

842354240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

842354240257 is an equidigital number, since it uses as much as digits as its factorization.

842354240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2150400, while the sum is 46.

The spelling of 842354240257 in words is "eight hundred forty-two billion, three hundred fifty-four million, two hundred forty thousand, two hundred fifty-seven".