165605755 has 16 divisors (see below), whose sum is σ = 240477120. Its totient is φ = 106877952.

The previous prime is 165605731. The next prime is 165605779. The reversal of 165605755 is 557506561.

It is an interprime number because it is at equal distance from previous prime (165605731) and next prime (165605779).

It is a cyclic number.

It is not a de Polignac number, because 165605755 - 2¹³ = 165597563 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138570 + ... + 139759.

It is an arithmetic number, because the mean of its divisors is an integer number (15029820).

Almost surely, 2^165605755 is an apocalyptic number.

165605755 is a deficient number, since it is larger than the sum of its proper divisors (74871365).

165605755 is a wasteful number, since it uses less digits than its factorization.

165605755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278358.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 165605755 is about 12868.7899586558. The cubic root of 165605755 is about 549.1510373497.

The spelling of 165605755 in words is "one hundred sixty-five million, six hundred five thousand, seven hundred fifty-five".