161663166 has 96 divisors (see below), whose sum is σ = 430230528. Its totient is φ = 42819840.

The previous prime is 161663147. The next prime is 161663219. The reversal of 161663166 is 661366161.

It is a happy number.

161663166 is a `hidden beast` number, since 1 + 6 + 16 + 631 + 6 + 6 = 666.

161663166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161663166² = 52269958482287112, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 161663166.

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, 151551 + ... + 152613.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^161663166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161663166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215115264).

161663166 is an abundant number, since it is smaller than the sum of its proper divisors (268567362).

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

161663166 is a wasteful number, since it uses less digits than its factorization.

161663166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1163 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 161663166 is about 12714.6830868882. The cubic root of 161663166 is about 544.7580959380.

The spelling of 161663166 in words is "one hundred sixty-one million, six hundred sixty-three thousand, one hundred sixty-six".