165555775 has 48 divisors (see below), whose sum is σ = 271054080. Its totient is φ = 97113600.

The previous prime is 165555773. The next prime is 165555787. The reversal of 165555775 is 577555561.

It is not a de Polignac number, because 165555775 - 2¹ = 165555773 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165555773) 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, 30196 + ... + 35254.

It is an arithmetic number, because the mean of its divisors is an integer number (5646960).

Almost surely, 2^165555775 is an apocalyptic number.

165555775 is a deficient number, since it is larger than the sum of its proper divisors (105498305).

165555775 is a wasteful number, since it uses less digits than its factorization.

165555775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104 (or 5099 counting only the distinct ones).

The product of its digits is 918750, while the sum is 46.

The square root of 165555775 is about 12866.8479045957. The cubic root of 165555775 is about 549.0957869943.

The spelling of 165555775 in words is "one hundred sixty-five million, five hundred fifty-five thousand, seven hundred seventy-five".