166020665511535 has 16 divisors (see below), whose sum is σ = 209730176409600. Its totient is φ = 125814271350816.

The previous prime is 166020665511521. The next prime is 166020665511541. The reversal of 166020665511535 is 535115566020661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166020665511535 is a prime.

It is a super-2 number, since 2×166020665511535² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81750279 + ... + 83756488.

It is an arithmetic number, because the mean of its divisors is an integer number (13108136025600).

Almost surely, 2^{166020665511535} is an apocalyptic number.

166020665511535 is a deficient number, since it is larger than the sum of its proper divisors (43709510898065).

166020665511535 is a wasteful number, since it uses less digits than its factorization.

166020665511535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165517350.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 166020665511535 in words is "one hundred sixty-six trillion, twenty billion, six hundred sixty-five million, five hundred eleven thousand, five hundred thirty-five".