165540550 has 48 divisors (see below), whose sum is σ = 356405760. Its totient is φ = 56028960.

The previous prime is 165540511. The next prime is 165540581. The reversal of 165540550 is 55045561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24657 + ... + 30643.

It is an arithmetic number, because the mean of its divisors is an integer number (7425120).

Almost surely, 2^165540550 is an apocalyptic number.

165540550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165540550 is an abundant number, since it is smaller than the sum of its proper divisors (190865210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165540550 is a wasteful number, since it uses less digits than its factorization.

165540550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6085 (or 6080 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 165540550 is about 12866.2562542489. The cubic root of 165540550 is about 549.0789543194.

The spelling of 165540550 in words is "one hundred sixty-five million, five hundred forty thousand, five hundred fifty".