165551633 has 16 divisors (see below), whose sum is σ = 185675280. Its totient is φ = 146555136.

The previous prime is 165551629. The next prime is 165551651. The reversal of 165551633 is 336155561.

It is a happy number.

165551633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 4464769 + 161086864 = 2113^2 + 12692^2 .

It is not a de Polignac number, because 165551633 - 2² = 165551629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165551593 and 165551602.

It is not an unprimeable number, because it can be changed into a prime (165551833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57791 + ... + 60587.

It is an arithmetic number, because the mean of its divisors is an integer number (11604705).

Almost surely, 2^165551633 is an apocalyptic number.

165551633 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165551633 is a deficient number, since it is larger than the sum of its proper divisors (20123647).

165551633 is a wasteful number, since it uses less digits than its factorization.

165551633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996.

The product of its digits is 40500, while the sum is 35.

The square root of 165551633 is about 12866.6869473070. The cubic root of 165551633 is about 549.0912077245.

The spelling of 165551633 in words is "one hundred sixty-five million, five hundred fifty-one thousand, six hundred thirty-three".