165165250445331 has 4 divisors (see below), whose sum is σ = 220220333927112. Its totient is φ = 110110166963552.

The previous prime is 165165250445311. The next prime is 165165250445339. The reversal of 165165250445331 is 133544052561561.

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

It is a cyclic number.

It is not a de Polignac number, because 165165250445331 - 2¹⁰ = 165165250444307 is a prime.

It is a super-2 number, since 2×165165250445331² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165165250445339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27527541740886 + ... + 27527541740891.

It is an arithmetic number, because the mean of its divisors is an integer number (55055083481778).

Almost surely, 2^{165165250445331} is an apocalyptic number.

165165250445331 is a deficient number, since it is larger than the sum of its proper divisors (55055083481781).

165165250445331 is an equidigital number, since it uses as much as digits as its factorization.

165165250445331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55055083481780.

The product of its (nonzero) digits is 6480000, while the sum is 51.

The spelling of 165165250445331 in words is "one hundred sixty-five trillion, one hundred sixty-five billion, two hundred fifty million, four hundred forty-five thousand, three hundred thirty-one".