1585857142873 has 2 divisors, whose sum is σ = 1585857142874. Its totient is φ = 1585857142872.

The previous prime is 1585857142861. The next prime is 1585857142889. The reversal of 1585857142873 is 3782417585851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1566710332489 + 19146810384 = 1251683^2 + 138372^2 .

It is an emirp because it is prime and its reverse (3782417585851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1585857142873 - 2⁵ = 1585857142841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1585857142823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 792928571436 + 792928571437.

It is an arithmetic number, because the mean of its divisors is an integer number (792928571437).

Almost surely, 2^{1585857142873} is an apocalyptic number.

It is an amenable number.

1585857142873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1585857142873 is an equidigital number, since it uses as much as digits as its factorization.

1585857142873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264000, while the sum is 64.

The spelling of 1585857142873 in words is "one trillion, five hundred eighty-five billion, eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred seventy-three".