663940100 has 36 divisors (see below), whose sum is σ = 1525503924. Its totient is φ = 249953280.

The previous prime is 663940097. The next prime is 663940139. The reversal of 663940100 is 1049366.

It can be written as a sum of positive squares in 6 ways, for example, as 5299204 + 658640896 = 2302^2 + 25664^2 .

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 11 ways as a sum of consecutive naturals, for example, 193577 + ... + 196976.

It is an arithmetic number, because the mean of its divisors is an integer number (42375109).

Almost surely, 2^663940100 is an apocalyptic number.

It is an amenable number.

663940100 is an abundant number, since it is smaller than the sum of its proper divisors (861563824).

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

663940100 is a wasteful number, since it uses less digits than its factorization.

663940100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390584 (or 390577 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 663940100 is about 25767.0351418241. The cubic root of 663940100 is about 872.3878997638.

Adding to 663940100 its reverse (1049366), we get a palindrome (664989466).

The spelling of 663940100 in words is "six hundred sixty-three million, nine hundred forty thousand, one hundred".