165555645 has 32 divisors (see below), whose sum is σ = 280750080. Its totient is φ = 83073600.

The previous prime is 165555629. The next prime is 165555653. The reversal of 165555645 is 546555561.

It is not a de Polignac number, because 165555645 - 2⁴ = 165555629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165555597 and 165555606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41112 + ... + 44958.

It is an arithmetic number, because the mean of its divisors is an integer number (8773440).

Almost surely, 2^165555645 is an apocalyptic number.

165555645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165555645 is a deficient number, since it is larger than the sum of its proper divisors (115194435).

165555645 is a wasteful number, since it uses less digits than its factorization.

165555645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025.

The product of its digits is 450000, while the sum is 42.

The square root of 165555645 is about 12866.8428528524. The cubic root of 165555645 is about 549.0956432714.

The spelling of 165555645 in words is "one hundred sixty-five million, five hundred fifty-five thousand, six hundred forty-five".