161545164 has 72 divisors (see below), whose sum is σ = 420424704. Its totient is φ = 48232800.

The previous prime is 161545147. The next prime is 161545183. The reversal of 161545164 is 461545161.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102309 + ... + 103875.

It is an arithmetic number, because the mean of its divisors is an integer number (5839232).

Almost surely, 2^161545164 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 161545164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210212352).

161545164 is an abundant number, since it is smaller than the sum of its proper divisors (258879540).

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

161545164 is a wasteful number, since it uses less digits than its factorization.

161545164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1654 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 161545164 is about 12710.0418567367. The cubic root of 161545164 is about 544.6255194761.

The spelling of 161545164 in words is "one hundred sixty-one million, five hundred forty-five thousand, one hundred sixty-four".