165670078081 has 4 divisors (see below), whose sum is σ = 165741830100. Its totient is φ = 165598326064.

The previous prime is 165670078073. The next prime is 165670078127. The reversal of 165670078081 is 180870076561.

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 54017197056 + 111652881025 = 232416^2 + 334145^2 .

It is a cyclic number.

It is not a de Polignac number, because 165670078081 - 2³ = 165670078073 is a prime.

It is a super-2 number, since 2×165670078081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165670078031) 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, 35872546 + ... + 35877163.

It is an arithmetic number, because the mean of its divisors is an integer number (41435457525).

Almost surely, 2^165670078081 is an apocalyptic number.

It is an amenable number.

165670078081 is a deficient number, since it is larger than the sum of its proper divisors (71752019).

165670078081 is an equidigital number, since it uses as much as digits as its factorization.

165670078081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71752018.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 165670078081 in words is "one hundred sixty-five billion, six hundred seventy million, seventy-eight thousand, eighty-one".