161660145 has 8 divisors (see below), whose sum is σ = 258656256. Its totient is φ = 86218736.

The previous prime is 161660131. The next prime is 161660183. The reversal of 161660145 is 541066161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161660145 - 2⁸ = 161659889 is a prime.

It is a super-2 number, since 2×161660145² = 52268004962842050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5388657 + ... + 5388686.

It is an arithmetic number, because the mean of its divisors is an integer number (32332032).

Almost surely, 2^161660145 is an apocalyptic number.

161660145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161660145 is a deficient number, since it is larger than the sum of its proper divisors (96996111).

161660145 is a wasteful number, since it uses less digits than its factorization.

161660145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10777351.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161660145 is about 12714.5642866753. The cubic root of 161660145 is about 544.7547026182.

The spelling of 161660145 in words is "one hundred sixty-one million, six hundred sixty thousand, one hundred forty-five".