161655104 has 56 divisors (see below), whose sum is σ = 347094048. Its totient is φ = 74257920.

The previous prime is 161655089. The next prime is 161655107. The reversal of 161655104 is 401556161.

It is a super-2 number, since 2×161655104² = 52264745298501632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161655107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275099 + ... + 275685.

It is an arithmetic number, because the mean of its divisors is an integer number (6198108).

Almost surely, 2^161655104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161655104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173547024).

161655104 is an abundant number, since it is smaller than the sum of its proper divisors (185438944).

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

161655104 is a wasteful number, since it uses less digits than its factorization.

161655104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 161655104 is about 12714.3660479003. The cubic root of 161655104 is about 544.7490402516.

The spelling of 161655104 in words is "one hundred sixty-one million, six hundred fifty-five thousand, one hundred four".