165427122785 has 4 divisors (see below), whose sum is σ = 198512547348. Its totient is φ = 132341698224.

The previous prime is 165427122781. The next prime is 165427122811. The reversal of 165427122785 is 587221724561.

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 70971091216 + 94456031569 = 266404^2 + 307337^2 .

It is a cyclic number.

It is not a de Polignac number, because 165427122785 - 2² = 165427122781 is a prime.

It is a super-2 number, since 2×165427122785² (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 (165427122781) 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, 16542712274 + ... + 16542712283.

It is an arithmetic number, because the mean of its divisors is an integer number (49628136837).

Almost surely, 2^165427122785 is an apocalyptic number.

It is an amenable number.

165427122785 is a deficient number, since it is larger than the sum of its proper divisors (33085424563).

165427122785 is an equidigital number, since it uses as much as digits as its factorization.

165427122785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33085424562.

The product of its digits is 1881600, while the sum is 50.

The spelling of 165427122785 in words is "one hundred sixty-five billion, four hundred twenty-seven million, one hundred twenty-two thousand, seven hundred eighty-five".