1663412020 has 12 divisors (see below), whose sum is σ = 3493165284. Its totient is φ = 665364800.

The previous prime is 1663411999. The next prime is 1663412021. The reversal of 1663412020 is 202143661.

It can be written as a sum of positive squares in 2 ways, for example, as 1198405924 + 465006096 = 34618^2 + 21564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663412021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41585281 + ... + 41585320.

It is an arithmetic number, because the mean of its divisors is an integer number (291097107).

Almost surely, 2^1663412020 is an apocalyptic number.

1663412020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663412020 is an abundant number, since it is smaller than the sum of its proper divisors (1829753264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663412020 is a wasteful number, since it uses less digits than its factorization.

1663412020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83170610 (or 83170608 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1663412020 is about 40784.9484491522. The cubic root of 1663412020 is about 1184.8588365259.

Adding to 1663412020 its reverse (202143661), we get a palindrome (1865555681).

The spelling of 1663412020 in words is "one billion, six hundred sixty-three million, four hundred twelve thousand, twenty".