1663131829 has 4 divisors (see below), whose sum is σ = 1664247276. Its totient is φ = 1662016384.

The previous prime is 1663131823. The next prime is 1663131881. The reversal of 1663131829 is 9281313661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9281313661 = 367 ⋅25289683.

It can be written as a sum of positive squares in 2 ways, for example, as 882208804 + 780923025 = 29702^2 + 27945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663131829 - 2⁹ = 1663131317 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663131791 and 1663131800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663131823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555484 + ... + 558469.

It is an arithmetic number, because the mean of its divisors is an integer number (416061819).

Almost surely, 2^1663131829 is an apocalyptic number.

It is an amenable number.

1663131829 is a deficient number, since it is larger than the sum of its proper divisors (1115447).

1663131829 is a wasteful number, since it uses less digits than its factorization.

1663131829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115446.

The product of its digits is 46656, while the sum is 40.

The square root of 1663131829 is about 40781.5133240541. The cubic root of 1663131829 is about 1184.7923055201.

The spelling of 1663131829 in words is "one billion, six hundred sixty-three million, one hundred thirty-one thousand, eight hundred twenty-nine".