1585853852981 has 2 divisors, whose sum is σ = 1585853852982. Its totient is φ = 1585853852980.

The previous prime is 1585853852977. The next prime is 1585853853011. The reversal of 1585853852981 is 1892583585851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1062497100625 + 523356752356 = 1030775^2 + 723434^2 .

It is a cyclic number.

It is not a de Polignac number, because 1585853852981 - 2² = 1585853852977 is a prime.

It is a super-2 number, since 2×1585853852981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1585853852911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 792926926490 + 792926926491.

It is an arithmetic number, because the mean of its divisors is an integer number (792926926491).

Almost surely, 2^{1585853852981} is an apocalyptic number.

It is an amenable number.

1585853852981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1585853852981 is an equidigital number, since it uses as much as digits as its factorization.

1585853852981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240000, while the sum is 68.

The spelling of 1585853852981 in words is "one trillion, five hundred eighty-five billion, eight hundred fifty-three million, eight hundred fifty-two thousand, nine hundred eighty-one".