1685038305861 has 16 divisors (see below), whose sum is σ = 2515409181120. Its totient is φ = 1114783609680.

The previous prime is 1685038305859. The next prime is 1685038305917.

1685038305861 is a `hidden beast` number, since 1 + 6 + 8 + 50 + 3 + 8 + 3 + 0 + 586 + 1 = 666.

1685038305861 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1685038305861 - 2¹ = 1685038305859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1685038305798 and 1685038305807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685038305961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238198090 + ... + 238205163.

It is an arithmetic number, because the mean of its divisors is an integer number (157213073820).

Almost surely, 2^{1685038305861} is an apocalyptic number.

It is an amenable number.

1685038305861 is a deficient number, since it is larger than the sum of its proper divisors (830370875259).

1685038305861 is a wasteful number, since it uses less digits than its factorization.

1685038305861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476403393 (or 476403387 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 1685038305861 in words is "one trillion, six hundred eighty-five billion, thirty-eight million, three hundred five thousand, eight hundred sixty-one".