165424819791 has 24 divisors (see below), whose sum is σ = 277075184512. Its totient is φ = 85934970000.

The previous prime is 165424819753. The next prime is 165424819811. The reversal of 165424819791 is 197918424561.

It is not a de Polignac number, because 165424819791 - 2¹⁴ = 165424803407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165424814791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32548585 + ... + 32553666.

Almost surely, 2^165424819791 is an apocalyptic number.

165424819791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165424819791 is a deficient number, since it is larger than the sum of its proper divisors (111650364721).

165424819791 is a wasteful number, since it uses less digits than its factorization.

165424819791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65102283 (or 65102272 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 57.

The spelling of 165424819791 in words is "one hundred sixty-five billion, four hundred twenty-four million, eight hundred nineteen thousand, seven hundred ninety-one".