1663705283409 has 27 divisors (see below), whose sum is σ = 2602284382737. Its totient is φ = 1023787679616.

The previous prime is 1663705283389. The next prime is 1663705283417. The reversal of 1663705283409 is 9043825073661.

The square root of 1663705283409 is 1289847.

It is a perfect power (a square), and thus also a powerful number.

1663705283409 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 70 + 528 + 3 + 40 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 275785673409 + 1387919610000 = 525153^2 + 1178100^2 .

It is not a de Polignac number, because 1663705283409 - 2¹¹ = 1663705281361 is a prime.

It is a super-2 number, since 2×1663705283409² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1663705283809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 50287497 + ... + 50320569.

It is a 1-persistent number, because it is pandigital, but 2⋅1663705283409 = 3327410566818 is not.

Almost surely, 2^{1663705283409} is an apocalyptic number.

1663705283409 is the 1289847-th square number.

1663705283409 is the 644924-th centered octagonal number.

It is an amenable number.

1663705283409 is a deficient number, since it is larger than the sum of its proper divisors (938579099328).

1663705283409 is an frugal number, since it uses more digits than its factorization.

1663705283409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66178 (or 33089 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 1663705283409 in words is "one trillion, six hundred sixty-three billion, seven hundred five million, two hundred eighty-three thousand, four hundred nine".