165945601 has 4 divisors (see below), whose sum is σ = 174679600. Its totient is φ = 157211604.

The previous prime is 165945599. The next prime is 165945607. The reversal of 165945601 is 106549561.

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 165945601 - 2¹ = 165945599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165945607) 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, 4366971 + ... + 4367008.

It is an arithmetic number, because the mean of its divisors is an integer number (43669900).

Almost surely, 2^165945601 is an apocalyptic number.

It is an amenable number.

165945601 is a deficient number, since it is larger than the sum of its proper divisors (8733999).

165945601 is an equidigital number, since it uses as much as digits as its factorization.

165945601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8733998.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 165945601 is about 12881.9874631207. The cubic root of 165945601 is about 549.5264254060.

The spelling of 165945601 in words is "one hundred sixty-five million, nine hundred forty-five thousand, six hundred one".