165453555 has 32 divisors (see below), whose sum is σ = 274959360. Its totient is φ = 84855680.

The previous prime is 165453553. The next prime is 165453557. The reversal of 165453555 is 555354561.

It is an interprime number because it is at equal distance from previous prime (165453553) and next prime (165453557).

It is not a de Polignac number, because 165453555 - 2¹ = 165453553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165453553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134674 + ... + 135896.

It is an arithmetic number, because the mean of its divisors is an integer number (8592480).

Almost surely, 2^165453555 is an apocalyptic number.

165453555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165453555 is a deficient number, since it is larger than the sum of its proper divisors (109505805).

165453555 is a wasteful number, since it uses less digits than its factorization.

165453555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 225000, while the sum is 39.

The square root of 165453555 is about 12862.8750674179. The cubic root of 165453555 is about 548.9827533310.

It can be divided in two parts, 16545 and 3555, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 165453555 in words is "one hundred sixty-five million, four hundred fifty-three thousand, five hundred fifty-five".