1683747449145 has 20 divisors (see below), whose sum is σ = 3018273205860. Its totient is φ = 897998639328.

The previous prime is 1683747449093. The next prime is 1683747449147. The reversal of 1683747449145 is 5419447473861.

It is a happy number.

1683747449145 is a `hidden beast` number, since 1 + 6 + 8 + 3 + 7 + 47 + 449 + 145 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1306510722729 + 377236726416 = 1143027^2 + 614196^2 .

It is not a de Polignac number, because 1683747449145 - 2¹⁰ = 1683747448121 is a prime.

It is a super-2 number, since 2×1683747449145² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1683747449147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2078700150 + ... + 2078700959.

It is an arithmetic number, because the mean of its divisors is an integer number (150913660293).

Almost surely, 2^{1683747449145} is an apocalyptic number.

1683747449145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1683747449145 is a deficient number, since it is larger than the sum of its proper divisors (1334525756715).

1683747449145 is an equidigital number, since it uses as much as digits as its factorization.

1683747449145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157401126 (or 4157401117 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 1683747449145 in words is "one trillion, six hundred eighty-three billion, seven hundred forty-seven million, four hundred forty-nine thousand, one hundred forty-five".