1705239250681 has 2 divisors, whose sum is σ = 1705239250682. Its totient is φ = 1705239250680.

The previous prime is 1705239250669. The next prime is 1705239250697. The reversal of 1705239250681 is 1860529325071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1672407622656 + 32831628025 = 1293216^2 + 181195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1705239250681 - 2¹³ = 1705239242489 is a prime.

It is a super-2 number, since 2×1705239250681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1705239250661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 852619625340 + 852619625341.

It is an arithmetic number, because the mean of its divisors is an integer number (852619625341).

Almost surely, 2^{1705239250681} is an apocalyptic number.

It is an amenable number.

1705239250681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1705239250681 is an equidigital number, since it uses as much as digits as its factorization.

1705239250681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 1705239250681 in words is "one trillion, seven hundred five billion, two hundred thirty-nine million, two hundred fifty thousand, six hundred eighty-one".