165991045 has 8 divisors (see below), whose sum is σ = 217297440. Its totient is φ = 120720720.

The previous prime is 165991039. The next prime is 165991057. The reversal of 165991045 is 540199561.

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

It is not a de Polignac number, because 165991045 - 2¹³ = 165982853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165990989 and 165991007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1508955 + ... + 1509064.

It is an arithmetic number, because the mean of its divisors is an integer number (27162180).

Almost surely, 2^165991045 is an apocalyptic number.

It is an amenable number.

165991045 is a deficient number, since it is larger than the sum of its proper divisors (51306395).

165991045 is a wasteful number, since it uses less digits than its factorization.

165991045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018035.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 165991045 is about 12883.7512006403. The cubic root of 165991045 is about 549.5765832077.

The spelling of 165991045 in words is "one hundred sixty-five million, nine hundred ninety-one thousand, forty-five".