165581043 has 8 divisors (see below), whose sum is σ = 221028288. Its totient is φ = 110260584.

The previous prime is 165581033. The next prime is 165581051. The reversal of 165581043 is 340185561.

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

It is not a de Polignac number, because 165581043 - 2⁴ = 165581027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165580995 and 165581013.

It is not an unprimeable number, because it can be changed into a prime (165581033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28605 + ... + 33902.

It is an arithmetic number, because the mean of its divisors is an integer number (27628536).

Almost surely, 2^165581043 is an apocalyptic number.

165581043 is a deficient number, since it is larger than the sum of its proper divisors (55447245).

165581043 is an equidigital number, since it uses as much as digits as its factorization.

165581043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63393.

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

The square root of 165581043 is about 12867.8297704003. The cubic root of 165581043 is about 549.1237208765.

The spelling of 165581043 in words is "one hundred sixty-five million, five hundred eighty-one thousand, forty-three".