161745120 has 96 divisors (see below), whose sum is σ = 566123040. Its totient is φ = 43130880.

The previous prime is 161745107. The next prime is 161745121. The reversal of 161745120 is 21547161.

It is a happy number.

161745120 is a `hidden beast` number, since 1 + 617 + 45 + 1 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161745120² = 52322967687628800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161745121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14401 + ... + 23040.

It is an arithmetic number, because the mean of its divisors is an integer number (5897115).

Almost surely, 2^161745120 is an apocalyptic number.

161745120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161745120 is an abundant number, since it is smaller than the sum of its proper divisors (404377920).

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

161745120 is a wasteful number, since it uses less digits than its factorization.

161745120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37465 (or 37451 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 161745120 is about 12717.9054879331. The cubic root of 161745120 is about 544.8501341432.

The spelling of 161745120 in words is "one hundred sixty-one million, seven hundred forty-five thousand, one hundred twenty".