165243550 has 12 divisors (see below), whose sum is σ = 307353096. Its totient is φ = 66097400.

The previous prime is 165243527. The next prime is 165243593. The reversal of 165243550 is 55342561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1652386 + ... + 1652485.

It is an arithmetic number, because the mean of its divisors is an integer number (25612758).

Almost surely, 2^165243550 is an apocalyptic number.

165243550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165243550 is a deficient number, since it is larger than the sum of its proper divisors (142109546).

165243550 is a wasteful number, since it uses less digits than its factorization.

165243550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304883 (or 3304878 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 165243550 is about 12854.7092538104. The cubic root of 165243550 is about 548.7503861365.

The spelling of 165243550 in words is "one hundred sixty-five million, two hundred forty-three thousand, five hundred fifty".