663576217920 has 448 divisors, whose sum is σ = 2918589235200. Its totient is φ = 137885829120.

The previous prime is 663576217891. The next prime is 663576217933. The reversal of 663576217920 is 29712675366.

663576217920 is a `hidden beast` number, since 6 + 6 + 3 + 5 + 7 + 621 + 7 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×663576217920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 166561 + ... + 1163999.

Almost surely, 2^663576217920 is an apocalyptic number.

663576217920 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 663576217920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459294617600).

663576217920 is an abundant number, since it is smaller than the sum of its proper divisors (2255013017280).

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

663576217920 is a wasteful number, since it uses less digits than its factorization.

663576217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997483 (or 997467 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 663576217920 in words is "six hundred sixty-three billion, five hundred seventy-six million, two hundred seventeen thousand, nine hundred twenty".