663440654220 has 96 divisors (see below), whose sum is σ = 1884811094208. Its totient is φ = 174333652992.

The previous prime is 663440654183. The next prime is 663440654221. The reversal of 663440654220 is 22456044366.

It is not an unprimeable number, because it can be changed into a prime (663440654221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4735822 + ... + 4873898.

It is an arithmetic number, because the mean of its divisors is an integer number (19633448898).

Almost surely, 2^663440654220 is an apocalyptic number.

663440654220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663440654220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942405547104).

663440654220 is an abundant number, since it is smaller than the sum of its proper divisors (1221370439988).

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

663440654220 is a wasteful number, since it uses less digits than its factorization.

663440654220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139259 (or 139257 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 42.

Adding to 663440654220 its reverse (22456044366), we get a palindrome (685896698586).

The spelling of 663440654220 in words is "six hundred sixty-three billion, four hundred forty million, six hundred fifty-four thousand, two hundred twenty".