165663947424 has 48 divisors (see below), whose sum is σ = 448895865600. Its totient is φ = 53439982080.

The previous prime is 165663947389. The next prime is 165663947431. The reversal of 165663947424 is 424749366561.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×165663947424² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27830349 + ... + 27836300.

It is an arithmetic number, because the mean of its divisors is an integer number (9351997200).

Almost surely, 2^165663947424 is an apocalyptic number.

It is an amenable number.

165663947424 is an abundant number, since it is smaller than the sum of its proper divisors (283231918176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165663947424 is a wasteful number, since it uses less digits than its factorization.

165663947424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55666693 (or 55666685 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 57.

The spelling of 165663947424 in words is "one hundred sixty-five billion, six hundred sixty-three million, nine hundred forty-seven thousand, four hundred twenty-four".