663401744220 has 48 divisors (see below), whose sum is σ = 1900723144320. Its totient is φ = 172793011776.

The previous prime is 663401744191. The next prime is 663401744233. The reversal of 663401744220 is 22447104366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128563650 + ... + 128568809.

It is an arithmetic number, because the mean of its divisors is an integer number (39598398840).

Almost surely, 2^663401744220 is an apocalyptic number.

663401744220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663401744220 is an abundant number, since it is smaller than the sum of its proper divisors (1237321400100).

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

663401744220 is a wasteful number, since it uses less digits than its factorization.

663401744220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257132514 (or 257132512 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 39.

Adding to 663401744220 its reverse (22447104366), we get a palindrome (685848848586).

The spelling of 663401744220 in words is "six hundred sixty-three billion, four hundred one million, seven hundred forty-four thousand, two hundred twenty".