1663360520 has 16 divisors (see below), whose sum is σ = 3742561260. Its totient is φ = 665344192.

The previous prime is 1663360513. The next prime is 1663360537. The reversal of 1663360520 is 250633661.

It can be written as a sum of positive squares in 2 ways, for example, as 1566101476 + 97259044 = 39574^2 + 9862^2 .

It is an unprimeable number.

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, 20791967 + ... + 20792046.

Almost surely, 2^1663360520 is an apocalyptic number.

1663360520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663360520 is an abundant number, since it is smaller than the sum of its proper divisors (2079200740).

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

1663360520 is a wasteful number, since it uses less digits than its factorization.

1663360520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41584024 (or 41584020 counting only the distinct ones).

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

The square root of 1663360520 is about 40784.3170838988. The cubic root of 1663360520 is about 1184.8466084752.

The spelling of 1663360520 in words is "one billion, six hundred sixty-three million, three hundred sixty thousand, five hundred twenty".