165850545 has 48 divisors (see below), whose sum is σ = 315318528. Its totient is φ = 74188800.

The previous prime is 165850541. The next prime is 165850549. The reversal of 165850545 is 545058561.

It is an interprime number because it is at equal distance from previous prime (165850541) and next prime (165850549).

It is not a de Polignac number, because 165850545 - 2² = 165850541 is a prime.

It is a super-3 number, since 3×165850545³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165850541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32145 + ... + 36945.

It is an arithmetic number, because the mean of its divisors is an integer number (6569136).

Almost surely, 2^165850545 is an apocalyptic number.

165850545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165850545 is a deficient number, since it is larger than the sum of its proper divisors (149467983).

165850545 is a wasteful number, since it uses less digits than its factorization.

165850545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870 (or 4863 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 165850545 is about 12878.2974418205. The cubic root of 165850545 is about 549.4214798484.

The spelling of 165850545 in words is "one hundred sixty-five million, eight hundred fifty thousand, five hundred forty-five".