165827865601 has 4 divisors (see below), whose sum is σ = 165872578900. Its totient is φ = 165783152304.

The previous prime is 165827865587. The next prime is 165827865617. The reversal of 165827865601 is 106568728561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31138131600 + 134689734001 = 176460^2 + 367001^2 .

It is a cyclic number.

It is not a de Polignac number, because 165827865601 - 2⁹ = 165827865089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165827865641) 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, 22351086 + ... + 22358503.

It is an arithmetic number, because the mean of its divisors is an integer number (41468144725).

Almost surely, 2^165827865601 is an apocalyptic number.

It is an amenable number.

165827865601 is a deficient number, since it is larger than the sum of its proper divisors (44713299).

165827865601 is an equidigital number, since it uses as much as digits as its factorization.

165827865601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44713298.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 165827865601 in words is "one hundred sixty-five billion, eight hundred twenty-seven million, eight hundred sixty-five thousand, six hundred one".