165220626543543 has 12 divisors (see below), whose sum is σ = 238652434646808. Its totient is φ = 110146891195440.

The previous prime is 165220626543491. The next prime is 165220626543649. The reversal of 165220626543543 is 345345626022561.

165220626543543 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 2 + 0 + 626 + 5 + 4 + 3 + 5 + 4 + 3 = 666.

It is not a de Polignac number, because 165220626543543 - 2²¹ = 165220624446391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165220626543543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165220626543443) 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 11 ways as a sum of consecutive naturals, for example, 10580680 + ... + 21033117.

It is an arithmetic number, because the mean of its divisors is an integer number (19887702887234).

Almost surely, 2^{165220626543543} is an apocalyptic number.

165220626543543 is a deficient number, since it is larger than the sum of its proper divisors (73431808103265).

165220626543543 is a wasteful number, since it uses less digits than its factorization.

165220626543543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32194494 (or 32194491 counting only the distinct ones).

The product of its (nonzero) digits is 31104000, while the sum is 54.

The spelling of 165220626543543 in words is "one hundred sixty-five trillion, two hundred twenty billion, six hundred twenty-six million, five hundred forty-three thousand, five hundred forty-three".