663620617205280 has 576 divisors, whose sum is σ = 2612520168410880. Its totient is φ = 150254920138752.

The previous prime is 663620617205261. The next prime is 663620617205347. The reversal of 663620617205280 is 82502716026366.

663620617205280 is a `hidden beast` number, since 6 + 6 + 3 + 620 + 6 + 1 + 7 + 2 + 0 + 5 + 2 + 8 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24169437312 + ... + 24169464768.

It is an arithmetic number, because the mean of its divisors is an integer number (4535625292380).

Almost surely, 2^{663620617205280} is an apocalyptic number.

663620617205280 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 663620617205280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1306260084205440).

663620617205280 is an abundant number, since it is smaller than the sum of its proper divisors (1948899551205600).

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

663620617205280 is a wasteful number, since it uses less digits than its factorization.

663620617205280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50001 (or 49990 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 663620617205280 in words is "six hundred sixty-three trillion, six hundred twenty billion, six hundred seventeen million, two hundred five thousand, two hundred eighty".