163889011566 has 96 divisors (see below), whose sum is σ = 418529599488. Its totient is φ = 45376148160.

The previous prime is 163889011549. The next prime is 163889011621. The reversal of 163889011566 is 665110988361.

163889011566 is a `hidden beast` number, since 1 + 6 + 388 + 90 + 115 + 66 = 666.

It is a super-2 number, since 2×163889011566² (a number of 23 digits) contains 22 as substring.

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, 568996 + ... + 807176.

It is an arithmetic number, because the mean of its divisors is an integer number (4359683328).

Almost surely, 2^163889011566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163889011566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209264799744).

163889011566 is an abundant number, since it is smaller than the sum of its proper divisors (254640587922).

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

163889011566 is a wasteful number, since it uses less digits than its factorization.

163889011566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238366 (or 238363 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 163889011566 in words is "one hundred sixty-three billion, eight hundred eighty-nine million, eleven thousand, five hundred sixty-six".