165556065 has 16 divisors (see below), whose sum is σ = 269380800. Its totient is φ = 86799552.

The previous prime is 165556021. The next prime is 165556087. The reversal of 165556065 is 560655561.

It is not a de Polignac number, because 165556065 - 2⁷ = 165555937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92650 + ... + 94419.

It is an arithmetic number, because the mean of its divisors is an integer number (16836300).

Almost surely, 2^165556065 is an apocalyptic number.

165556065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165556065 is a deficient number, since it is larger than the sum of its proper divisors (103824735).

165556065 is a wasteful number, since it uses less digits than its factorization.

165556065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187136.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 165556065 is about 12866.8591738621. The cubic root of 165556065 is about 549.0961076067.

The spelling of 165556065 in words is "one hundred sixty-five million, five hundred fifty-six thousand, sixty-five".