1663255452672 has 396 divisors, whose sum is σ = 5508508933200. Its totient is φ = 482095595520.

The previous prime is 1663255452641. The next prime is 1663255452707. The reversal of 1663255452672 is 2762545523661.

1663255452672 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 2 + 5 + 545 + 26 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (396).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25615704 + ... + 25680552.

Almost surely, 2^{1663255452672} is an apocalyptic number.

1663255452672 is a gapful number since it is divisible by the number (12) 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 1663255452672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2754254466600).

1663255452672 is an abundant number, since it is smaller than the sum of its proper divisors (3845253480528).

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

1663255452672 is a wasteful number, since it uses less digits than its factorization.

1663255452672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64920 (or 64888 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 54.

The spelling of 1663255452672 in words is "one trillion, six hundred sixty-three billion, two hundred fifty-five million, four hundred fifty-two thousand, six hundred seventy-two".