165990633 has 4 divisors (see below), whose sum is σ = 221320848. Its totient is φ = 110660420.

The previous prime is 165990611. The next prime is 165990661. The reversal of 165990633 is 336099561.

165990633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165990633 - 2⁶ = 165990569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165990133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27665103 + ... + 27665108.

It is an arithmetic number, because the mean of its divisors is an integer number (55330212).

Almost surely, 2^165990633 is an apocalyptic number.

It is an amenable number.

165990633 is a deficient number, since it is larger than the sum of its proper divisors (55330215).

165990633 is an equidigital number, since it uses as much as digits as its factorization.

165990633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55330214.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 165990633 is about 12883.7352114983. The cubic root of 165990633 is about 549.5761285130.

The spelling of 165990633 in words is "one hundred sixty-five million, nine hundred ninety thousand, six hundred thirty-three".