163655680 has 104 divisors (see below), whose sum is σ = 402210864. Its totient is φ = 63897600.

The previous prime is 163655669. The next prime is 163655693. The reversal of 163655680 is 86556361.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249215 + ... + 1249345.

Almost surely, 2^163655680 is an apocalyptic number.

163655680 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 163655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201105432).

163655680 is an abundant number, since it is smaller than the sum of its proper divisors (238555184).

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

163655680 is an equidigital number, since it uses as much as digits as its factorization.

163655680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 163655680 is about 12792.7979738601. The cubic root of 163655680 is about 546.9870288259.

The spelling of 163655680 in words is "one hundred sixty-three million, six hundred fifty-five thousand, six hundred eighty".