161041645 has 8 divisors (see below), whose sum is σ = 197963640. Its totient is φ = 125690880.

The previous prime is 161041627. The next prime is 161041667. The reversal of 161041645 is 546140161.

It can be written as a sum of positive squares in 4 ways, for example, as 9972964 + 151068681 = 3158^2 + 12291^2 .

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

It is not a de Polignac number, because 161041645 - 2¹⁵ = 161008877 is a prime.

It is a super-3 number, since 3×161041645³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 392580 + ... + 392989.

It is an arithmetic number, because the mean of its divisors is an integer number (24745455).

Almost surely, 2^161041645 is an apocalyptic number.

It is an amenable number.

161041645 is a deficient number, since it is larger than the sum of its proper divisors (36921995).

161041645 is an equidigital number, since it uses as much as digits as its factorization.

161041645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785615.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 161041645 is about 12690.2184772367. The cubic root of 161041645 is about 544.0590840616.

It can be divided in two parts, 16104164 and 5, that added together give a square (16104169 = 4013²).

The spelling of 161041645 in words is "one hundred sixty-one million, forty-one thousand, six hundred forty-five".