1663213325 has 12 divisors (see below), whose sum is σ = 2062892148. Its totient is φ = 1330243200.

The previous prime is 1663213319. The next prime is 1663213327. The reversal of 1663213325 is 5233123661.

It can be written as a sum of positive squares in 6 ways, for example, as 32103556 + 1631109769 = 5666^2 + 40387^2 .

It is not a de Polignac number, because 1663213325 - 2²⁴ = 1646436109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663213291 and 1663213300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663213327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182579 + ... + 191471.

It is an arithmetic number, because the mean of its divisors is an integer number (171907679).

Almost surely, 2^1663213325 is an apocalyptic number.

It is an amenable number.

1663213325 is a deficient number, since it is larger than the sum of its proper divisors (399678823).

1663213325 is an equidigital number, since it uses as much as digits as its factorization.

1663213325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16384 (or 16379 counting only the distinct ones).

The product of its digits is 19440, while the sum is 32.

The square root of 1663213325 is about 40782.5124900367. The cubic root of 1663213325 is about 1184.8116574149.

Adding to 1663213325 its reverse (5233123661), we get a palindrome (6896336986).

The spelling of 1663213325 in words is "one billion, six hundred sixty-three million, two hundred thirteen thousand, three hundred twenty-five".