165556550 has 12 divisors (see below), whose sum is σ = 307935276. Its totient is φ = 66222600.

The previous prime is 165556511. The next prime is 165556561. The reversal of 165556550 is 55655561.

165556550 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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, 1655516 + ... + 1655615.

It is an arithmetic number, because the mean of its divisors is an integer number (25661273).

Almost surely, 2^165556550 is an apocalyptic number.

165556550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165556550 is a deficient number, since it is larger than the sum of its proper divisors (142378726).

165556550 is a wasteful number, since it uses less digits than its factorization.

165556550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311143 (or 3311138 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 165556550 is about 12866.8780207166. The cubic root of 165556550 is about 549.0966438024.

The spelling of 165556550 in words is "one hundred sixty-five million, five hundred fifty-six thousand, five hundred fifty".