165684049631 has 2 divisors, whose sum is σ = 165684049632. Its totient is φ = 165684049630.

The previous prime is 165684049577. The next prime is 165684049633. The reversal of 165684049631 is 136940486561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165684049631 - 2¹⁸ = 165683787487 is a prime.

It is a super-2 number, since 2×165684049631² (a number of 23 digits) contains 22 as substring.

Together with 165684049633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165684049633) 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 as a sum of consecutive naturals, namely, 82842024815 + 82842024816.

It is an arithmetic number, because the mean of its divisors is an integer number (82842024816).

Almost surely, 2^165684049631 is an apocalyptic number.

165684049631 is a deficient number, since it is larger than the sum of its proper divisors (1).

165684049631 is an equidigital number, since it uses as much as digits as its factorization.

165684049631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 165684049631 in words is "one hundred sixty-five billion, six hundred eighty-four million, forty-nine thousand, six hundred thirty-one".