163706215680 has 432 divisors, whose sum is σ = 669652663680. Its totient is φ = 36127752192.

The previous prime is 163706215679. The next prime is 163706215703. The reversal of 163706215680 is 86512607361.

163706215680 is a `hidden beast` number, since 1 + 6 + 370 + 6 + 215 + 68 + 0 = 666.

163706215680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 2303559 + ... + 2373561.

Almost surely, 2^163706215680 is an apocalyptic number.

163706215680 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 163706215680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334826331840).

163706215680 is an abundant number, since it is smaller than the sum of its proper divisors (505946448000).

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

163706215680 is a wasteful number, since it uses less digits than its factorization.

163706215680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70066 (or 70049 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 163706215680 in words is "one hundred sixty-three billion, seven hundred six million, two hundred fifteen thousand, six hundred eighty".