165331522550 has 48 divisors (see below), whose sum is σ = 309000727152. Its totient is φ = 65813760000.

The previous prime is 165331522511. The next prime is 165331522561. The reversal of 165331522550 is 55225133561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41320550 + ... + 41324550.

It is an arithmetic number, because the mean of its divisors is an integer number (6437515149).

Almost surely, 2^165331522550 is an apocalyptic number.

165331522550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165331522550 is a deficient number, since it is larger than the sum of its proper divisors (143669204602).

165331522550 is a wasteful number, since it uses less digits than its factorization.

165331522550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793 (or 7788 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 165331522550 in words is "one hundred sixty-five billion, three hundred thirty-one million, five hundred twenty-two thousand, five hundred fifty".