163491799680 has 384 divisors, whose sum is σ = 638698132800. Its totient is φ = 39633960960.

The previous prime is 163491799673. The next prime is 163491799703. The reversal of 163491799680 is 86997194361.

163491799680 is a `hidden beast` number, since 1 + 63 + 491 + 7 + 9 + 9 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1662936 + ... + 1758504.

Almost surely, 2^163491799680 is an apocalyptic number.

163491799680 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 163491799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319349066400).

163491799680 is an abundant number, since it is smaller than the sum of its proper divisors (475206333120).

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

163491799680 is an equidigital number, since it uses as much as digits as its factorization.

163491799680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95614 (or 95590 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 163491799680 in words is "one hundred sixty-three billion, four hundred ninety-one million, seven hundred ninety-nine thousand, six hundred eighty".