1685612113849 has 2 divisors, whose sum is σ = 1685612113850. Its totient is φ = 1685612113848.

The previous prime is 1685612113799. The next prime is 1685612113963. The reversal of 1685612113849 is 9483112165861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329731859600 + 355880254249 = 1153140^2 + 596557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685612113849 - 2¹⁵ = 1685612081081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1685612113849.

It is not a weakly prime, because it can be changed into another prime (1685612113249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842806056924 + 842806056925.

It is an arithmetic number, because the mean of its divisors is an integer number (842806056925).

Almost surely, 2^{1685612113849} is an apocalyptic number.

It is an amenable number.

1685612113849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685612113849 is an equidigital number, since it uses as much as digits as its factorization.

1685612113849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 55.

The spelling of 1685612113849 in words is "one trillion, six hundred eighty-five billion, six hundred twelve million, one hundred thirteen thousand, eight hundred forty-nine".