165211367129 has 4 divisors (see below), whose sum is σ = 165243162084. Its totient is φ = 165179572176.

The previous prime is 165211367107. The next prime is 165211367141. The reversal of 165211367129 is 921763112561.

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 114517944025 + 50693423104 = 338405^2 + 225152^2 .

It is a cyclic number.

It is not a de Polignac number, because 165211367129 - 2²⁴ = 165194589913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165211367129.

It is not an unprimeable number, because it can be changed into a prime (165211369129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15889682 + ... + 15900075.

It is an arithmetic number, because the mean of its divisors is an integer number (41310790521).

Almost surely, 2^165211367129 is an apocalyptic number.

It is an amenable number.

165211367129 is a deficient number, since it is larger than the sum of its proper divisors (31794955).

165211367129 is an equidigital number, since it uses as much as digits as its factorization.

165211367129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31794954.

The product of its digits is 136080, while the sum is 44.

The spelling of 165211367129 in words is "one hundred sixty-five billion, two hundred eleven million, three hundred sixty-seven thousand, one hundred twenty-nine".