161660928000 has 1152 divisors, whose sum is σ = 659543399424. Its totient is φ = 34603008000.

The previous prime is 161660927999. The next prime is 161660928007. The reversal of 161660928000 is 829066161.

It is a super-2 number, since 2×161660928000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 161660928000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161660928007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7028735989 + ... + 7028736011.

It is an arithmetic number, because the mean of its divisors is an integer number (572520312).

Almost surely, 2^161660928000 is an apocalyptic number.

161660928000 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 161660928000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329771699712).

161660928000 is an abundant number, since it is smaller than the sum of its proper divisors (497882471424).

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

161660928000 is an equidigital number, since it uses as much as digits as its factorization.

161660928000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 161660928000 in words is "one hundred sixty-one billion, six hundred sixty million, nine hundred twenty-eight thousand".