161220150 has 288 divisors, whose sum is σ = 554631168. Its totient is φ = 32659200.

The previous prime is 161220131. The next prime is 161220161. The reversal of 161220150 is 51022161.

161220150 is a `hidden beast` number, since 1 + 612 + 2 + 0 + 1 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1269387 + ... + 1269513.

Almost surely, 2^161220150 is an apocalyptic number.

161220150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161220150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277315584).

161220150 is an abundant number, since it is smaller than the sum of its proper divisors (393411018).

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

161220150 is a wasteful number, since it uses less digits than its factorization.

161220150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161220150 is about 12697.2497021993. The cubic root of 161220150 is about 544.2600287841.

The spelling of 161220150 in words is "one hundred sixty-one million, two hundred twenty thousand, one hundred fifty".