16491780748800 has 1920 divisors, whose sum is σ = 73078442680320. Its totient is φ = 3561217228800.

The previous prime is 16491780748787. The next prime is 16491780748843. The reversal of 16491780748800 is 884708719461.

16491780748800 is a `hidden beast` number, since 1 + 6 + 491 + 78 + 0 + 74 + 8 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1920).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4618251015 + ... + 4618254585.

It is an arithmetic number, because the mean of its divisors is an integer number (38061688896).

Almost surely, 2^{16491780748800} is an apocalyptic number.

16491780748800 is a gapful number since it is divisible by the number (10) 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 16491780748800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36539221340160).

16491780748800 is an abundant number, since it is smaller than the sum of its proper divisors (56586661931520).

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

16491780748800 is a wasteful number, since it uses less digits than its factorization.

16491780748800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721 (or 3694 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 63.

The spelling of 16491780748800 in words is "sixteen trillion, four hundred ninety-one billion, seven hundred eighty million, seven hundred forty-eight thousand, eight hundred".