663361820 has 48 divisors (see below), whose sum is σ = 1599696000. Its totient is φ = 228525120.

The previous prime is 663361819. The next prime is 663361823. The reversal of 663361820 is 28163366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663361823) 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 15 ways as a sum of consecutive naturals, for example, 75170 + ... + 83529.

It is an arithmetic number, because the mean of its divisors is an integer number (33327000).

Almost surely, 2^663361820 is an apocalyptic number.

It is an amenable number.

663361820 is an abundant number, since it is smaller than the sum of its proper divisors (936334180).

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

663361820 is a wasteful number, since it uses less digits than its factorization.

663361820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158738 (or 158736 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 663361820 is about 25755.8113830646. The cubic root of 663361820 is about 872.1345480878.

The spelling of 663361820 in words is "six hundred sixty-three million, three hundred sixty-one thousand, eight hundred twenty".