165631045 has 8 divisors (see below), whose sum is σ = 199255320. Its totient is φ = 132172800.

The previous prime is 165631033. The next prime is 165631049. The reversal of 165631045 is 540136561.

It can be written as a sum of positive squares in 4 ways, for example, as 25421764 + 140209281 = 5042^2 + 11841^2 .

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

It is not a de Polignac number, because 165631045 - 2⁷ = 165630917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165630998 and 165631016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165631049) 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, 39300 + ... + 43309.

It is an arithmetic number, because the mean of its divisors is an integer number (24906915).

Almost surely, 2^165631045 is an apocalyptic number.

It is an amenable number.

165631045 is a deficient number, since it is larger than the sum of its proper divisors (33624275).

165631045 is an equidigital number, since it uses as much as digits as its factorization.

165631045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83015.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 165631045 is about 12869.7725310123. The cubic root of 165631045 is about 549.1789899267.

The spelling of 165631045 in words is "one hundred sixty-five million, six hundred thirty-one thousand, forty-five".