1663729943040 has 2160 divisors, whose sum is σ = 7081746864192. Its totient is φ = 373347532800.

The previous prime is 1663729943033. The next prime is 1663729943087. The reversal of 1663729943040 is 403499273661.

It is a happy number.

1663729943040 is a `hidden beast` number, since 16 + 6 + 3 + 72 + 99 + 430 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (2160).

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

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 53668707825 + ... + 53668707855.

Almost surely, 2^{1663729943040} is an apocalyptic number.

1663729943040 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 1663729943040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3540873432096).

1663729943040 is an abundant number, since it is smaller than the sum of its proper divisors (5418016921152).

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

1663729943040 is an equidigital number, since it uses as much as digits as its factorization.

1663729943040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 1663729943040 in words is "one trillion, six hundred sixty-three billion, seven hundred twenty-nine million, nine hundred forty-three thousand, forty".